Tanks & Accessories

The 10 Best Aquarium Silicones of 2020

Best Aquarium Silicone

An aquarium silicone is a powerful adhesive that is used to seal the glass that would typically be found in aquariums, and other materials that bond with the sealant.

You can use a silicone sealant to repair cracks on the aquarium, windows, doors, wood, pipes, windshields, lens housing, and many more applications.

When shopping for the silicone, get one that’s weatherproof and waterproof to ensure it thrives in different conditions, especially if you’ll be using it for aquarium repairs.

In our top 10 aquarium silicones review and buying guide, we’ll help you choose the best sealant for your projects. 

10 Best Aquarium Silicones – Review

IMAGE

PRODUCT

FEATURES

GE GE012A

1. GE GE012A (Best Overall)

  • 100% waterproof and weatherproof
  • Multi-purpose sealant
  • Stain-resistant when cured
  • Cures in 30 minutes
Dap 00688

2. Dap 00688 (Safest)

  • Safe for food contact
  • Safe for dishwasher and microwave
  • Non-toxic to fish post-cure
  • Works in freshwater and saltwater
J-B Weld 31310

3. J-B Weld 31310 (All-purpose Sealant)

  • All-purpose adhesive sealant
  • Mold and mildew resistant
  • Weather-resistant and versatile
  • Easy to use
ASI Clear Aquarium Silicone

4. ASI Clear Aquarium Silicone (Non-slump)

  • Strong adhesive capacity
  • Non-slump capability
  • -18℃ to 50℃ operating temperature
  • Great value for money
Loctite 908570

5. Loctite 908570 (Versatile)

  • Ideal for indoor/outdoor repairs
  • Bonds on multiple materials
  • Aquarium-safe
  • Crack and shrink resistant
MarineLand 31010

6. MarineLand 31010 (For Ornament & Aquarium Repair)

  • Ideal for aquarium and ornament repair
  • Squeeze-tube for easy application
  • 100% clear silicone
  • Comes in a range of sizes
Aqueon 100165003

7. Aqueon 100165003 (High-Strength)

  • High-strength silicone sealant
  • Crack and shrink-resistant
  • Fish-safe silicone
  • Offered in a variety of sizes
Aquascape 29186

8. Aquascape 29186 (For Skimmer Boxes)

  • Seals skimmer boxes and filters
  • Safe for fish, aquatic life, and pets
  • Black professional sealant
  • Water-tight sealing
C.R. Laurence GE 1200

9. C.R. Laurence GE 1200 (For Construction Projects)

  • Construction-grade sealant
  • Crack and shrink resistant
  • Fast cure rate
  • Withstands extreme weather
Red Devil 0826

10. Red Devil 0826 (High-flexibility)

  • Permanently flexible
  • Crack, shrink, and peel resistant
  • Water-resistant
  • Usable in sub-zero temperatures

PRODUCT

1. GE GE012A

(Best Overall)

GE GE012A
  • 100% waterproof and weatherproof
  • Multi-purpose sealant
  • Stain-resistant when cured
  • Cures in 30 minutes

2. Dap 00688

(Safest)

Dap 00688
  • Safe for food contact
  • Safe for dishwasher and microwave
  • Non-toxic to fish post-cure
  • Works in freshwater and saltwater

3. J-B Weld 31310

(All-purpose sealant)

J-B Weld 31310
  • All-purpose adhesive sealant
  • Mold and mildew resistant
  • Weather-resistant and versatile
  • Easy to use

4. ASI Clear Aquarium Silicone

(Non-slump)

ASI Clear Aquarium Silicone
  • Strong adhesive capacity
  • Non-slump capability
  • -18℃ to 50℃ operating temperature
  • Great value for money

5. Loctite 908570

(Versatile)

Loctite 908570
  • Ideal for indoor/outdoor repairs
  • Bonds on multiple materials
  • Aquarium-safe
  • Crack and shrink resistant

6. MarineLand 31010

(For Ornament & Aquarium Repair)

MarineLand 31010
  • Ideal for aquarium and ornament repair
  • Squeeze-tube for easy application
  • 100% clear silicone
  • Comes in a range of sizes

7. Aqueon 100165003

(High-Strength)

Aqueon 100165003
  • High-strength silicone sealant
  • Crack and shrink-resistant
  • Fish-safe silicone
  • Offered in a variety of sizes

8. Aquascape 29186

(For Skimmer Boxes)

Aquascape 29186
  • Seals skimmer boxes and filters
  • Safe for fish, aquatic life, and pets
  • Black professional sealant
  • Water-tight sealing

9. C.R. Laurence GE 1200

(For Construction Projects)

C.R. Laurence GE 1200
  • Construction-grade sealant
  • Crack and shrink resistant
  • Fast cure rate
  • Withstands extreme weather

10. Red Devil 0826

(High-flexibility)

Red Devil 0826
  • Permanently flexible
  • Crack, shrink, and peel resistant
  • Water-resistant
  • Usable in sub-zero temperatures

1. GE GE012A – Best Overall Aquarium Silicone

GE GE012A

Photo: GE

  • Ingredient: 100% Silicone
  • Package: 10.1-Ounce Tube

GE GE012A is the best overall aquarium silicone on our list. This sealant has a vast range of superior properties that make it rise above the competition.

It is made of 100% silicone and is also 100% waterproof and 100% weatherproof. You can use it in multiple weather conditions, even harsh ones, and it will still excel in its adhesive capacity.

When this sealant is fully cured, it will resist mold and mildew, two of the leading causes of stubborn stains in your aquarium and other surfaces.

This silicone sealant meets multiple federal specifications and standards, including being compliant about incidental food contact under FDA 21 CFR177.2600. It also meets ASTM C920 Class 25 requirements.

You can use it for sealing gaps in your aquarium glass, and also use it for exterior weatherproofing, sealing windows, doors, sidings, times, vents, pipes, and many more applications.

As for curing, this sealant takes only 30 minutes and can be exposed to water after 12 hours, which is a record compared to other silicones that take days to cure.

For the efficient application of the GE GE012A silicone, you need a caulking gun, which is sold separately, hence additional costs.

Pros:

  • Waterproof and weatherproof
  • Non-toxic to fish after curing
  • Stain-resistant
  • Cures rapidly

Cons:

  • A caulking gun is not included

2. Dap 00688 – Safest Aquarium Silicone

Dap 00688

Photo: Dap

  • Ingredient: 100% Silicone
  • Package: 2.8-Ounce Tube

Dap 00688 is a unique aquarium silicone because of its food-safe properties, which make it ideal for use in the kitchen for applications such as utensils and appliance repairs.

Safety is a key focus of this silicone sealant. Once cures, it is non-toxic to fish, hence its suitability for aquarium use. Not only is it microwave and dishwasher safe, but it is also approved for food contact.

These properties combine to make the silicone sealant a great A recommended to your household and kitchen repair kit.

The silicone is also flexible. Thus, it will neither crack nor shrink even after curing, making it durable and reliable for most of your home repair projects.

Another quality we can appreciate about the Dap 00688 is that it works in both freshwater and saltwater aquariums and similar setups.

An issue we noted with the Dap 00688 is that its tube packaging is not the strongest. A firm squeeze of the tube to eject the sealant risks rupturing the tube at the bottom.

Pros:

  • Safe for food contact
  • Dishwasher and microwave safe
  • Non-toxic to fish after curing
  • Ideal for both freshwater and saltwater use

Cons:

  • Its tube packaging is not the strongest

3. J-B Weld 31310 – All-purpose Aquarium Silicone

J-B Weld 31310

Photo: J-B Weld

  • Ingredient: 100% Silicone
  • Package: 3-Ounce Tube

J-B Weld 31310 is a great all-purpose sealant adhesive that is also room temperature vulcanized (RTV). It is ideal for household or mechanical assembly tasks.

This silicone sealant has proven effective in creating a strong waterproof, mold and mildew resistant seal on multiple surfaces and materials.

The fact that is weatherproof and crack-resistant makes it especially great for use in automotive assembly, and in the house as well.

Other surfaces and materials where you can apply the sealant include cloth, ceramic, rubber, carpets, lens housings, aquariums, showers, and many more.

It is also easy to use and does not require any professionals to apply. Simply follow the included user instructions and apply the sealant to the desired surfaces.

An issue that may not appeal to many is the fact that J-B Weld 31310 is offered in a 3-ounce tube, which is a low capacity for intensive projects that may demand a lot of adhesive.

Pros:

  • Great for household and mechanical assembly
  • Resistant to mold and mildew stains
  • Weatherproof and versatile
  • Easy to use

Cons:

  • Capacity may be too low

4. ASI Clear Aquarium Silicone – Non-slump Aquarium Silicone

ASI Clear Aquarium Silicone

Photo: ASI

  • Ingredient: 100% Silicone
  • Package: 10.2-Ounce Tube

ASI Clear Aquarium Silicone is a versatile sealant that can be sued on a range of materials and surfaces because of its non-slump properties.

This RTV sealant is especially useful when fixing aquariums because not only does it form strong cohesive bonds with glass, but it is also non-slump. You can apply it on vertical surfaces without worrying about flowing or sagging.

Also, you can apply the sealant on surface temperatures ranging from -18℃ to 50℃ (0℉ to 120℉) without damaging its adhesive properties.

You also love the fact that this silicone sealant can be used on both saltwater and freshwater aquariums and vivarium as well.

It’s capacity, which is the highest we have recorded in this category, also translates to great value for money.

The ASI Clear Aquarium Silicone does, however, take 7-10 days to cure fully, before you can add water to the aquarium. Some may find this duration a bit too long.

Pros:

  • Strong adhesive capacity
  • Non-slump for use on vertical surfaces
  • Wide range of operating temperature
  • Good value for money

Cons:

  • Takes long to cure fully

5. Loctite 908570 – Versatile Aquarium Silicone

Loctite 908570

Photo: Loctite

  • Ingredient: Silicone
  • Package: 2.7-Ounce Tube

Loctite 908570 is a versatile aquarium silicone that can be used in a wide range of repair projects, both indoor and outdoor.

The 100% silicone sealant can be used to repair door frames, vents, toys, appliances, gaskets, shoes, boots, fireplace doors, gaskets, and many more. It also bonds ABS, glass, porcelain, wood, stainless steel, fiberglass, tile, granite and vinyl.

Unlike some sealants we have encountered that are not recommended to aquariums, this one is aquarium-safe and won’t harm your fish once cured.

It will also resist cracking, shrinking, and peeling, all of which would ruin the adhesive capacity of the silicone.

Expect a full cure time of 24 hours from this silicone, which can be considered a great gain from the 7-10 days required to fully cure the ASI Clear Aquarium Silicone.

While Loctite 908570 is a versatile silicone sealant, it is not ideal for use on aquariums exceeding 30 gallons in water capacity. Also, some may be disappointed by its low capacity-per-tube of 2.7 ounces.

Pros:

  • Versatile silicone sealant
  • Bonds on multiple surfaces and materials
  • Safe for aquarium use
  • Resists cracking and shrinking

Cons:

  • Not ideal for high-capacity aquariums
  • Low capacity per tube

6. MarineLand 31010 – Silicone for Ornament and Aquarium Repair

MarineLand 31010

Photo: MarineLand

  • Ingredient: 100% Silicone
  • Package: 10.3-Ounce Tube

MarineLand 31010 is a reliable silicone sealant that not only repairs leaky aquariums but also performs excellently in repairing broken ornaments.

It is especially great for ornament repair because of the squeeze-tube packaging, whose narrow nozzle allows for precision sealant application. You can count in it to target even the tiniest cracks on your precision ornaments to restore their glory.

Another reason it does a great ornament repair job is that it is made using 100% clear silicone. You’ll barely notice the adhesive when applied to ornaments.

You can also get the sealant in smaller 1-ounce and 3-ounce tubes for small repair tasks that don’t require a lot of adhesive.

We did note, however, that the 10-ounce tube of MarineLand 31010 is rather pricey and doesn’t offer great value for money, especially when compared with other cheaper silicones on our list.

Pros:

  • Seals aquariums and repairs ornaments
  • Squeeze-tube nozzle supports precision application
  • Clear silicone for effective repairs
  • Available in a range of sizes

Cons:

  • Not the best value for money

7. Aqueon 100165003 – High-Strength Aquarium Silicone

Aqueon 100165003

Photo: Aqueon

  • Ingredient: 100% Silicone
  • Package: 3-Ounce Tube

Aqueon 100165003 is a high-strength aquarium silicone, which is as strong as the sealant used to manufacture new aquariums.

It works by creating a permanent waterproof seal, which will neither shrink nor crack. The long-lasting bonds it creates with the surface being repaired ensure your aquarium never leaks again.

Furthermore, this sealant is made using 100% non-toxic silicone, which makes it safe for use on all aquariums. If your aquarium has a black seal, you can use the black sealant version of Aqueon 100165003 to do the repair job for a more appealing and professional result.

You get the silicone in an easy-to-apply squeeze tube, which won’t require a caulking gun like some of the other sealants we have reviewed.

It is also offered in a wide range of sizes, including 1-ounce, 5ounce, and 10-ounce 2-pack capacities, alongside this one. The sealant can also be used on both freshwater and saltwater aquariums.

An issue you may encounter with the Aqueon 100165003 is the strong smell it produces immediately after opening and application. However, it does disappear gradually after drying.

Pros:

  • High-strength sealant
  • Does not shrink or crack
  • Uses aquarium-safe silicone
  • Comes in a variety of sizes

Cons:

  • Strong smell following application

8. Aquascape 29186 – Aquarium Silicone Sealant for Skimmer Boxes

Aquascape 29186

Photo: Aquascape

  • Ingredient: Silicone
  • Package: 10.1-Ounce Tube

Aquascape 29186 is a high-strength silicone sealant build for use with pool and pond structures such as skimmer boxes and BioFalls by aquascape.

You can use the silicone to seal joints where liners attach to skimmer face plats and BioFalls snouts. It comes in handy when installing a skimmer box because of the silicone’s adhesive capabilities.

It is a reliable sealant that will prevent leaks in many aquatic systems. You’ll also appreciate the silicone for being fish-safe. It is also safe for plants, pets, and other aquatic life.

Because this sealant is offered in black color, you can count on it to make quick professional seals that are not distinguishable from the original finish. The bonds it forms with different compatible surfaces are also watertight.

You will, however, require a caulking gun for efficient application of the Aquascape 29186 sealant. This gun is not included with your purchase and must be purchased separately if needed.

Pros:

  • Effective skimmer box sealant
  • Safe for fish, pets, and aquatic life
  • Black color for professional seals
  • Water-tight bonding

Cons:

  • A caulking gun is not included

9. C.R. Laurence GE 1200 – Silicone Sealant for Construction Projects

C.R. Laurence GE 1200

Photo: C.R. Laurence

  • Ingredient: 100% Silicone
  • Package: 10.1-Ounce Tube

C.R. Laurence GE 1200 by General Electric is a strong sealant that is designed for use especially in construction projects, some of which demands strong adhesives.

It is a high-strength, high-modulus construction sealant that’s ideal for both general and structural glazing. This silicone sealant has demonstrated exceptional strength in stiffening elements to building glass and panels.

With this sealant, you won’t require a primer to secure the glass to frames. The silicone does not crack, shrink, or separate.

This silicone also boasts of a fast cure rate so that it does not slow down construction work. You can use it with many finishes and substrates, including glass coatings, polycarbonate, plastics, vinyl, powder-coated paints, and more.

In addition, the sealant has demonstrated long-term resistance to harsh temperatures, snow, rain, and wind.

The only issue you may encounter in the C.R. Laurence GE 1200 is that it requires a bit of effort to squeeze out the sealant especially when using it for the second time.

Pros:

  • Strong construction-grade sealant
  • Does not crack, shrink or separate
  • Cures rapidly
  • Resists harsh weather conditions

Cons:

  • Takes a bit of effort to squeeze out

10. Red Devil 0826 – High-flexibility Silicone Sealant

Red Devil 0826

Photo: Red Devil

  • Ingredient: 100% Silicone
  • Package: 9.8-Ounce Tube

Unlike many silicone sealants that dry up and become rigid after curing, the Red Devil 0826 is designed to remain flexible, while providing superior adhesion.

Its flexibility properties make it ideal for many home projects that may involve moving surfaces, such as windows, door frames, aluminum sidings, gutters, trims, air conditioners, and many more.

This architectural-grade sealant will not shrink, peel, or crack after curing, especially because of its permanent flexibility.

You’ll also love the fact that it is water-resistant, hence you can use it on surfaces that come into constant contact with water after the sealant has cured.

The silicone adhesive can also be used in sub-zero or freezing temperatures. You can depend on the silicone for winter projects.

Unfortunately, a key setback for this silicone sealant, which may discourage many buyers is that it doesn’t support underwater applications.

Pros:

  • Permanent flexibility after curing
  • Resistant to cracking, shrinking, and peeling
  • Water-resistant
  • Can be used in freezing temperatures

Cons:

  • Not recommended for underwater use

How to Buy the Best Aquarium Silicone

aquarium silicones

bostik-industrial.com

1. Aquarium Safe

If you’ll be using your silicone primarily for aquarium building and repair then it needs to be aquarium-safe, and non-toxic to fish.

Luckily, most of the silicone sealants we reviewed are aquarium-safe. However, ensure you read the user instructions that come with your silicone carefully to ensure you are choosing the right product for your aquarium and other projects.

2. Surface Materials

It is important to confirm the materials that your aquarium silicone is compatible with. You’ll probably be looking for an adhesive that can bond with multiple materials.

Some of the most common surface materials that are compatible with silicone sealants include glass, wood, vinyl, ceramic, cloth, and ABS.

Silicone such as Loctite 908570 can be used on materials such as stainless steel, fiberglass, and tile, which other sealants don’t bond well with.

3. Capacity

Aquarium silicone sealants come in different capacities depending primarily on the brand.

Most of the silicone designed for home use and DIY projects, such as the ones we reviewed, comes in capacities ranging from 2 ounces to 10 ounces.

You can get some silicone sealants sold as a single package contains several small tubes. Such would be great for intensive projects that require more than 1 tube of silicone.

4. Water Temperature

Water temperature is an important determinant of whether or not your silicone sealant retains its adhesive capacity.

Most sealants will hold firm without cracking or shrinking in both extreme hot and cold temperatures.

ASI Clear Aquarium Silicone, for instance, can work in surface temperatures of -18℃ to 50℃ (0℉ to 120℉). 

Ensure you check the application temperature of your silicone, as well as the temperature range it can operate in when cured.

5. Color of Texture

Aquarium silicone sealants come in different colors. The most common ones are black, cleat, and white.

The clear sealant is especially preferred for glass repairs because it blends in well with the color of the surface material. It is also great for repairing ornaments that may have a similar color or texture.

Some components such as aquariums may have black original seals. In such cases, it's best to use a black sealant to maintain color uniformity.

White silicone sealant is great for surfaces painted white. It will blend it with the surface without requiring a fresh coating of paint.

6. Easy to Apply

Silicone sealants should be easy to apply. They are known to dry very fast and a smooth application process ensures you make even seals that don’t ruin the surface material uniformity.

If you get a cartridge silicone sealant, you’ll need a caulking gun for easy and efficient application. You can also opt for a squeeze-tube sealant that also simplifies the application process.

7. Waterproof

Waterproof silicone is great especially is you’ll be using it on surfaces that come into close contact with water.

Aquarium silicone is only useful if it is waterproof because the primary role of the item is to hold fish water.

Luckily, all the silicones we reviewed are waterproof when fully cured. However, ensure you give the silicone enough time to cure before adding water to the aquarium or other setups.

Conclusion

In our top 10 aquarium silicone review, we’ve established the sealant is a handy item to have for many household and DIY repair tasks on multiple materials and surfaces requiring adhesive.

If you want the best of them all, go for the GE GE012A. It is waterproof and weatherproof, stain-resistant, and safe for minimal food contact.

Go for Dap 00688 if you want a silicone sealant that is safe for your fish, kitchen appliances, and even food contact.

If you want silicone that will retain its flexibility even after drying, go for the Red Devil 0826.

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