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10 Best Aquarium Safe Silicone For 2023 [Buyer’s Guide]

It's a real letdown when your fancy aquarium develops a crack and leaks water. Disposing of it is wasteful, so why not use a sealant?

Man using a silicone gun to repair a window

No, we're not talking about any ordinary sealing substance, but rather silicone ones, which are primarily meant for this purpose. However, finding an appropriate one is easier said than done since many duplicate products claim to be "100% silicone", only to leave you wiser later. 

The last thing you want is to accidentally contaminate your fish tank. That's why we decided to do all the hard work on your behalf and compile a list of 11 best aquarium silicone safes for 2022.

Without further ado, let's get down to business. 

Best Aquarium Silicone Safe 

Corals in a Marine Aquarium.

Each of these silicone sealants has been thoroughly researched and tested to ensure they are safe and non-toxic for use in aquariums. So, whether you're setting up a new aquarium or repairing a leaky tank, here's the list of the 10 best aquarium silicone-safe products to consider.

  1. Aqueon Silicone Sealant - Best Overall

The Aqueon Silicone Sealant is an excellent option for users looking to prevent leaks in aquariums without spending a lot. It's a fool-proof solution, and as such, improves the structural integrity of the fish tank. So, if you want something reliable, get this right away.

Aqueon Aquarium Silicone Sealant Black 3 Ounces
  • Waterproof seal stops leaks
  • Permanently flexible; does not crack or shrink

Why Did We Like It? 

First things first, it's a cinch to apply, thanks to the pointed nozzle tip, ensuring precise and hassle-free use. Furthermore, its waterproof composition creates a long-lasting seal that can stand the test of time. 

Meaning it won't crack or shrink, which usually happens with sub-standard sealants that eventually cause leaks. Besides, its high-strength formula makes for a reliable option, keeping your aquarium in good shape throughout. 

But that's not all; the sealant is rated 100% non-toxic, so you can expect superior performance without any adverse effects on the fish and other aquatic life. Also, it's suitable for use in all types of aquariums, which just goes on to emphasize its wide applicability. In short, it's one of the best options, be it for a large tank or a small fishbowl.

What Could've Been Better? 

While we are quite pleased with the performance of this sealant, we did find one glaring flaw. The packaging is far from acceptable, and more often than not, the bottom bursts open after a few applications. We would have liked it better if the tube container was not as flimsy. 



Pros

  • Pointed nozzle tip enables easy application
  • Sealant does not crack or shrink
  • 100% non-toxic formula; safe for aquatic life
  • Suitable for all types of aquariums




Cons

  • Tube container is quite flimsy



Size: 3 oz. | Curing Time: 24 hours | Temperature Resistance: -80°F to 450°F | Certifications: FDA, NSF
  1. Henkel Corporation 908570 Clear Silicone Sealant - Best For Versatility

Up next, we have picked the Henkel Corporation 908570 Clear Silicone Sealant, a highly functional option that can fix your aquarium in no time. However, it's not just limited to that; in fact, it can serve multiple other purposes, making it a more dependable choice.

Why Did We Like It? 

First of all, we're very impressed with its waterproof composition, allowing you to use the sealant without fear of dissolving or contamination. As such, it can be used on different surfaces, including glass, metal, ABS, ceramic, wood, porcelain, granite, tiles, marble, etc. 

Therefore, if you're looking for a multipurpose product that can also be used to fix other things, this one will not disappoint. It works as a sealant and adhesive, so you can use it for multiple DIY projects that require high-strength bonding. 

That said, you may apply it for repairing window and door frames, gaskets, shoes, boots, and toys, among other things. But since we're talking about aquariums, let's just say that it's compatible with both saltwater and freshwater models. Lastly, its temperature and weather resistance makes it beneficial in the long run.

What Could've Been Better? 

We're indeed very pleased with the results and do not have any complaints about its long-term performance. However, we'd suggest applying the sealant in a well-vented space, as it produces a lot of fumes. This could be a problem for users who feel uncomfortable using such chemical substances. 



Pros

  • Works on a wide range of surfaces
  • Suitable for saltwater and freshwater tanks
  • Ensures superior bonding and adhesive strength
  • Can be used for repairing other items




Cons

  • Produces a lot of fumes



Size: 2.7 oz. | Curing Time: 24 hours | Temperature Resistance: -75°F to 400°F | Certifications: None
  1. GE Sealants & Adhesives GE012A All Purpose Silicone - Best for Durability

It's a real bummer when your aquarium develops a tiny crack, and it eventually starts to expand due to the water pressure. Don't wait for it to worsen, and use the GE012A All Purpose Silicone to fix things permanently. So, if that sounds doable, buy this ASAP. 

GE Window & Door Sealant Clear All Purpose, 10.1 oz,...
  • 100% Waterproof and Weatherproof: This 100% silicone formula...
  • Excellent Flexibility and Strong Adhesion: Provides a...

Why Did We Like It?

Many users are skeptical about using products labeled “all-purpose,” as these are often part of marketing gimmicks that mislead people. We understand where these doubts stem from, and hence we tested all aspects of the product before adding it to our list. 

For starters, it's suitable for both indoor and outdoor use, something amiss in most other sealants in this price range. Meanwhile, its 100% weather-proof composition makes it exceptionally resilient and durable.

Long story short, you can use it in outdoor tanks and surfaces exposed to the rigors of nature. Besides, it's same-day, rain-ready within 12 hours of application, which further adds to the user's convenience. 

But the good things don't end here; the sealant ensures 7 years of mold and mildew protection, delivering superior performance and peace of mind. Lastly, it can also handle UV degradation and freezing temperatures, so you might as well use it on windows, trimmings, and other areas that need a quick fix. 

What Could've Been Better? 

The affordable price is one thing that instantly attracts many users. But then again, you must weigh in the cost of a caulk gun as it requires one for application. That won't be a problem unless you already own one, but otherwise, it just adds to the cost. 



Pros

  • Suitable for both indoor and outdoor use
  • 100% weather-proof composition
  • Same-day, rain-ready within 12 hours
  • 7 years of mold and mildew protection




Cons

  • Requires a caulk gun for application



Size: 10.1 oz. | Curing Time: 12 hours | Temperature Resistance: -40°F to 400°F | Certifications: None
  1. J-B Weld 31310 Silicone Sealant - Best Budget-Friendly

A tiny fracture in the fish tank should not force you to discard and replace it with a new one. Instead, consider getting the J-B Weld 31310 All-Purpose RTV Silicone Sealant to fix the source of leaks. So, just get a tube of this, and you'll be sorted in a blink. 

J-B Weld 31310 All-Purpose RTV Silicone Sealant and Adhesive...
  • Clear Silicone Sealant & Adhesive: Is A General Purpose...

Why Did We Like It? 

To begin with, we're very impressed with its wide applicability, which makes it ideal for most household DIY projects. So, if you'd rather buy something compatible with multiple surfaces, this one indeed checks the box. 

The best part about it is that the sealant does not crack or shrink and yet remains flexible. This feature alone puts it miles ahead of competitors, ensuring superior bonding strength throughout. Plus, it's water and weather-proof, creating strong adhesion that can withstand the elements. 

Therefore, you can use it to repair windshields, door frames, windows, and tubs, in addition to aquariums. The product is also mildew and mold-resistant, so you can confidently apply it in fish tanks without worrying about any undesirable growth.

What Could've Been Better? 

We do not have any complaints about its performance or durability, but we couldn't help but notice this one issue. The product inside the tube is quite stiff and takes a lot of effort to squeeze it out. This could be a problem for users who find it difficult to apply that sort of pressure. 



Pros

  • Sealant does not crack or shrink
  • Water and weather-proof composition
  • Product is mold and mildew-resistant
  • Suitable for a wide range of repairs




Cons

  • Sealant is quite stiff and difficult to apply



Size: 3 oz. | Curing Time: 24 hours | Temperature Resistance: -65°F to 500°F | Certifications: None
  1. Silco RTV 4500 Silicone Sealant - Best For Ease Of Use

If you would rather use a mild product, the Silco RTV 4500 Silicone Sealant is the ideal option. When it comes to repairing fish tanks, we usually look for solutions that won't harm aquatic life. But many also want a sealing substance that has zero impact on the user. Hence, this is a perfect choice. 

Sale
Silicone RTV 4500 Food Contact Safe High Strength Silicone...
  • Food Contact Safe 350F high temp
  • Impervious to all weather conditions

Why Did We Like It? 

There are many reasons, but let's begin with the basics. For starters, this product is a cinch to apply, all because of the easy-squeeze tube. This may not seem much, but anyone who had to struggle with silicone sealants will know what a relief that is. 

Furthermore, it's made of one-part acetoxy silicone rubber sealant, which renders it food-grade as per NSF and ANSI standards. This undoubtedly has to be its biggest USP, as most other products at this price point do not meet these standards. 

Other than that, it does not crack or become brittle with age, so you can expect your tank to function leak-free. As a matter of fact, it's also resistant to moisture, weathering, and extreme temperatures, and hence durability should be the least of your concerns. 

What Could've Been Better? 

While the manufacturers claim that the substance has a clear appearance, in reality, it's kind of silvery. It does not affect the sealant's performance or longevity, but we would have liked it better if it was advertised. That aside, it's still an excellent option to fix your aquarium. 



Pros

  • Available in an easy-squeeze tube
  • Product meets NSF and ANSI standards
  • Does not crack or becomes brittle with age
  • Moisture, weathering, and temperature resistant




Cons

  • Product does not have a clear appearance



Size: 2.8 oz. | Curing Time: 24 hours | Temperature Resistance: -65°F to 450°F | Certifications: FDA, USDA
  1. ASI Clear Aquarium Silicone Sealant

We're halfway through our recommendations, and now is a good time to introduce the ASI Clear Aquarium Silicone Sealant. If you're looking for something to leak-proof your tank with minimum effort, this product is bound to impress. Also, the affordable price tag makes it a steal deal in our books. 

Clear Aquarium Silicone Sealant - 10.2 Fluid oz Cartridge
  • Container size: 10.2 Oz. This high modulus component RTV...
  • The bonds are unaffected by continuous immersion in water...

Why Did We Like It? 

First things first, this product is solely made for aquariums, meaning you can expect unparalleled performance from the get-go. For the best results, we suggest thoroughly cleaning the glass and then applying the sealant at the center of the joint. 

A little bit goes a long way, and hence it's unlikely that you'll run out of this 10.2 Oz. container anytime soon. Besides, it forms superior, cohesive bonds that remain unaffected when continuously immersed in water. 

What impressed us the most is its non-slump quality, allowing users to apply it on vertical surfaces without flowing or sagging. This bit is essential if you're looking to avoid mess during a DIY project. 

Also, it's highly temperature resistant, with a constant operating range of -70°F to 450°F. Lastly, it's suitable for freshwater and saltwater aquariums, as well as vivariums, making it a truly versatile option.

What Could've Been Better? 

Nothing except the curing time. To explain further, this sealant requires a curing time of 7-10 days before you can add water or aquatic animals. While that's not a deal-breaker per se, many don't want to wait that long for a single project. In that case, we suggest looking for alternatives. 



Pros

  • Remains unaffected under continuous immersion
  • Does not flow or sag on vertical surfaces
  • Constant operating range of -70°F to 450°F
  • Suitable for different aquariums and vivarium




Cons

  • Long curing time of 7-10 days



Size: 10.2 oz. | Curing Time: 24 hours | Temperature Resistance: -40°F to 450°F | Certifications: NSF
  1. MarineLand Silicone Squeeze Tube

For aquarium owners, even a tiny leak in the structure is nothing short of a nightmare. Therefore, we recommend buying the MarineLand Silicone Squeeze Tube to keep your fish tank up and running. It's effective, strong, and highly resilient, in short, everything you expect from a sealant.

Why Did We Like It?

First off, we cannot get enough of the practicality and strength it offers, that too at a dirt cheap price. So, if you want something that can do the job while essentially keeping things low-maintenance, get this stat. 

Ideally, you should scrub the tank and dry it completely before applying the product, as it ensures better bonding and durability. After that, simply use the squeeze tube applicator to put tiny beads of sealant along the joint.

You don't need to excess, so it's best not to spread it like a film. So, whether it's a leaky fish tank or broken aquarium ornaments, this clear substance can patch it up in no time. Lastly, it takes only about 48 hours to cure, which is considerably less compared to most other sealing materials. 

What Could've Been Better? 

We are, for most parts, satisfied with its efficiency and durable performance. However, there's absolutely nothing you can do about the awful smell it gives out. But then again, it's a small price to pay if it ultimately keeps your fish safe in a leak-proof environment. 



Pros

  • Available at an affordable price
  • Easy to use squeeze tube applicator
  • Takes only 48 hours to cure
  • Works on broken aquarium ornaments




Cons

  • Gives out an awful smell



Size: 2.8 oz. | Curing Time: 24 hours | Temperature Resistance: -100°F to 500°F | Certifications: None
  1. Dap 00688 All-Purpose Adhesive Sealant

As aquarium owners, we understand the need for products that work without interfering with the water ecosystem. After all, one wrong purchase could pose a threat to aquatic life. That's why we suggest buying the Dap 00688 All-Purpose Adhesive Sealant as it undoubtedly checks both the boxes and more.

Why Did We Like It? 

To begin with, we're very impressed with the waterproof and watertight performance of this sealant, preventing the occurrence of leaks. Also, once applied, it does not crack, shrink or disintegrate, which further preserves the sanctity of the aquarium.  

Despite everything, it stays flexible, ensuring seamless use and removal when necessary. Therefore, if you want a practical solution to restore your fish tank, this product will not disappoint. 

In terms of cure time, it's not too bad either, requiring about 72 hours for the process. While that's not less, it certainly is better than traditional sealants that take about 7-10 days. Lastly, it's suitable for both freshwater and saltwater models, making it one of the most versatile options on our list.

What Could've Been Better? 

Well, it works as described, which is what we're looking for anyway. However, we couldn't help but notice this one glitch. Basically, it comes with a nozzle, which you can use only once since there's no cap for it. Honestly, that's impractical, and we don't think the manufacturers thought through this one. 



Pros

  • Does not crack, shrink or disintegrate
  • Flexibility ensures easy use and removal
  • Curing time of 72 hours
  • Suitable for both freshwater and saltwater aquariums




Cons

  • Nozzle is meant for one-time use only



Size: 2.8 oz. | Curing Time: 24 hours | Temperature Resistance: -40°F to 400°F | Certifications: None
  1. SELSIL Aquarium Silicone Sealant

We know how much you love your goldfish and black mollies and hence, understand the need for non-toxic products. That's where the Selsil Aquarium Silicone Sealant comes into the picture, providing superior bonding and lasting strength, all at a reasonable price. So, go ahead and add this to your shopping cart now. 

SELSIL Aquarium Silicone Clear Sealant - High Elasticity,...
  • SAFE FOR THE FISH: Selsil Aquarium Silicone is a silicone...
  • ADHESIVE FOR VARIOUS NON-POROUS SURFACES: This transparent...

Why Did We Like It?

This sealant is specially formulated for aquarium use and we can make out from its non-reactive nature. Therefore, it's suitable for a range of non-porous surfaces, including glass, ceramic tiles, aluminum, etc. 

All you need to do is load the cartridge in a caulk gun and apply it in a strip form. However, you should thoroughly cleanse the surface before putting the sealant, as any amount of dust, dirt, or grease can compromise efficiency. 

That said, its biggest USP is its resistance to Ozone and UV radiation. Furthermore, it can tolerate extreme temperatures without losing elasticity. Other than that, it does not pull, crack or discolor under any circumstances. So, if you're expecting high adhesion and insulation, this one is a solid investment, hands down.

What Could've Been Better? 

Well, there's no sugarcoating this, but the application is a bit clumsy. This is mainly because the gun squirts out the excess, which is hard to scrape off. So, if you don't mind spending a little more time in the process, this is surely a good buy. 



Pros

  • Compatible with glass, ceramic tiles, aluminum, etc.
  • Resistant to Ozone and UV radiation
  • Elasticity remains unaffected in extreme temperatures
  • Delivers high adhesion and insulation




Cons

  • Clumsy application; caulk gun squirts excess



Size: 10.14 oz. | Curing Time: 24 hours | Temperature Resistance: -40°F to 500°F | Certifications: FDA, NSF
  1. APEL Aquarium Silicone Sealant

The APEL Aquarium Silicone Sealant is an excellent option for anyone looking to save time and effort on repair tasks. Long story short, if you cannot wait to restore your tank and bring the fish to their original home, do not miss out on this one. 

Aquarium 100% Silicone Sealant (10.4 fl oz) Safe for Fish (1...
  • 100% Silicone - Apel’s aquarium sealant is always 100%...
  • Multipurpose - When it comes to your aquarium, our safe...

Why Did We Like It? 

For starters, we're very impressed with the strong bonding and non-toxic composition, which makes it the ideal choice for any fish tank. As such, it's a multipurpose option that not only prevents leaks but also attaches decoration to the bottom or sides of the aquarium. 

Furthermore, it's made of 100% silicone and does not contain any fungicides or additives that can negatively impact the fish. It also does not crack or shrink and yet remains flexible after application. 

So, if you want something that will maintain structural integrity as well as hold the decorations in place, the search ends here. That aside, it's a fast solution, given it gets touch dry in only 1-2 hours and takes just 24 hours to cure. 

Besides, it's waterproof and UV-resistant, which further expands its applicability. Basically, it works on a wide range of surfaces, including brick, wood, laminate, metal, PVC, etc., thereby giving you the best bang for the buck.

What Could've Been Better? 

Unfortunately, it does not work on cement or rocks, which could limit things for some users. Since many like to create a realistic waterscape with miniature rock caves and creeks, this may not be the perfect option in that case. You may want to look for other adhesives with wider compatibility.



Pros

  • Prevents leaks and attaches decoration
  • Does not contain any fungicides or additives
  • Sealant takes just 24 hours to cure
  • Works on brick, wood, laminate, PVC, metal, etc.




Cons

  • Not compatible with cement or rocks



Size: 10.4 oz. | Curing Time: 24 hours | Temperature Resistance: -40°F to 400°F | Certifications: FDA, NSF

Best Aquarium Silicone Safe Comparison Table

ProductSizeCuring TimeTemperature ResistanceCertifications
Aqueon Silicone Sealant3 oz.24 hours-80°F to 450°FFDA, NSF
Henkel Corporation 908570 Clear Silicone Sealant2.7 oz.24 hours-75°F to 400°FNone
GE Sealants & Adhesives GE012A All Purpose Silicone10.1 oz.12 hours-40°F to 400°FNone
J-B Weld 31310 Silicone Sealant3 oz.24 hours-65°F to 500°FNone
Silco RTV 4500 Silicone Sealant2.8 oz.24 hours-65°F to 450°FFDA, USDA
ASI Clear Aquarium Silicone Sealant10.2 oz.24 hours-40°F to 450°FNSF
MarineLand Silicone Squeeze Tube2.8 oz.24 hours-100°F to 500°FNone
Dap 00688 All-Purpose Adhesive Sealant2.8 oz.24 hours-40°F to 400°FNone
SELSIL Aquarium Silicone Sealant10.14 oz.24 hours-40°F to 500°FFDA, NSF
APEL Aquarium Silicone Sealant10.4 oz.24 hours-40°F to 400°FFDA, NSF

Buying Guide For The Best Aquarium Silicone Safe

Knowing all about the 11 best aquarium silicone may seem sufficient information to go ahead and place an order. However, there are a few factors that you must consider before arriving at a purchase decision. 

That's why we have put together a brief buyer's guide to walk you through these essential points. Let's take a look now.

  1. Easy Application

This is the first thing you want to consider when buying silicone sealant. While some products come with a nozzle, others need to be loaded in caulk guns. Regardless of how it works, it should be easy to apply, as you don't want to struggle while squirting it out. Also, even application enables better adhesion and reduces the chance of a mess. 

  1. Versatility

The next feature you'd want to invest in is versatility. A multipurpose product is always a good choice as you can use it for DIY projects. Besides, it's not just about repairing leaks, the wide compatibility of the sealant also lets you experiment with different aquarium ornaments and decorations. 

  1. Temperature Tolerance

Before buying any of these products, check their operating temperature range. Ideally, a high-quality sealant should remain unaffected by extremely high or low temperatures. This further contributes to its durability and adhesive strength, so it's best not to skimp on this one. 

Aquarium Silicone Safe FAQ's

  • Why do I need aquarium silicone safe?

    Regular silicone sealants may contain harmful chemicals that can leach into the water and harm aquatic animals. Aquarium silicone safe is specifically designed to be safe for use in aquariums and will not harm your fish or other aquatic creatures.

  • Can I use regular silicone in my aquarium?

    No, regular silicone is not safe for use in aquariums. It may contain harmful chemicals that can leach into the water and harm aquatic animals. Always use aquarium silicone safe in your aquarium.

  • How do I apply aquarium silicone safely?

    Aquarium silicone safe is applied in the same way as regular silicone sealant. Clean and dry the area that you wish to seal, and then apply the silicone sealant using a caulking gun or other application tools. Allow the sealant to dry completely before filling your aquarium with water.

  • How long does aquarium silicone safe take to dry?

    The drying time for aquarium silicone safe can vary depending on the brand and the conditions in which it is applied. Following the manufacturer’s instructions for application and drying times is important.

  • How do I know if the aquarium silicone safe is safe for my aquarium?

    Always look for a sealant specifically designed for use in aquariums and labeled as “aquarium safe” or “safe for use with aquatic animals”. Additionally, check the product label for information on its ingredients and certifications from organizations like the FDA and NSF.

  • Can I use aquarium silicone safe for both freshwater and saltwater aquariums?

    Yes, most aquarium silicone-safe products are safe for use in both freshwater and saltwater aquariums. However, it is important to check the product label to ensure that it is suitable for your specific aquarium setup.

  • How often should I reapply aquarium silicone safe?

    Aquarium silicone safe is designed to last for a long time, but it may need to be reapplied if it becomes damaged or begins to break down over time. Check your aquarium regularly for signs of damage or wear, and reapply the sealant as needed.

  • Guppys swimming in a fishbowl with clean white little stones and artificial water plants.

    Conclusion

    That's all from us!

    We hope you could find the most suitable option from our top 11 recommendations. But before you stock your shopping cart, here's some advice. 

    No matter what you buy, make sure to check the composition of the product. Keep an eye out for additives, as they can compromise the overall performance and interfere with the aquatic environment. Also, wear protective gloves and eyewear during the application, just to be on the safer side. On that note, we would like to sign off with a quick recap of our findings.

    This Aqueon Silicone Sealant is the best overall, and the Henkel Corporation 908570 Clear Silicone Sealant is the most versatile option. Meanwhile, the GE Sealants & Adhesives GE012A All Purpose Silicone is the most durable choice, and the J-B Weld 31310 All-Purpose RTV Silicone Sealant is the budget buy. 

    Till next time! Keep it sealed!

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