Will it fix a leaky plexiglass tank?

100% silicone is for use on glass and not recommended for long term adhesion on acrylics, plexiglass, plastics since they contain petroleum products which will cause the silicone to peel off in time. (MAY be fine for short-term use.) There are special adhesives/sealants for use with acrylics and plastics and they will be labeled as such. Plexiglass, specifically, needs an adhesive method that actually "melts" the plexiglass, which then creates the bond. 100% silicone adhesives/sealants will not do that.

Could this be used safely as a gasket around my filter screen at the bottom of dishwasher used to block food particles around edge of screen filter?

I’m no expert but as it is silicone and it is safe for aquariums once cured, it should be safe for a dishwasher.

Will salt water eat sealant

In general silicon sealants will handle salt water. I used this particular sealant for a fresh water tank, but I have used silicon sealants on my salt water sail boat without an issue. The main problem with all sealants is you need a clean, oil free, and dry surface for the sealant can properly attach to the surface. You need a humid, but not wet environment for the sealant to cure. I suggest placing a well dampened cloth in the bottom of the tank. You don't want water on the sealant, but you need moisture in the air.

After applying the silicone, approximately how many minutes do you have before taking the tape off?

if you mean using masking tape to keep the glue off an area, i would pull it off when it is still wet, and probably wouldnt wait more than 15 minutes to do so. Remember you can spritz the silicone with water to help it cure faster and better.

Midwest Hearth Clear Aquarium Silicone Sealant 10 2 Fluid Oz

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€ 66.80

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐠 Seal your aquatic masterpiece with confidence—no leaks, no limits!

NON SAG FORMULA - Applies cleanly on vertical surfaces—no drips, no mess
LONG LASTING CURE - Fully cures in 10 days for durable, chemical-resistant seals
TEMPERATURE TOUGHNESS - Withstands extreme temps from -70°F to 450°F without losing integrity
EASY REPAIR APPLICATION - Smooth tooling and trimming with solvent cleanup for professional results
AQUARIUM GRADE WATERPROOF SEAL - Ensures leak-proof, fish-safe bonding for fresh & saltwater tanks

Midwest Hearth Clear Aquarium Silicone Sealant is a premium RTV silicone designed specifically for aquarium construction and repair. It forms strong, waterproof, and non-toxic bonds to glass that endure continuous water immersion and extreme temperatures. Its non-sag formula allows precise vertical application, curing fully in 10 days to create durable, fish-safe seals ideal for fresh and saltwater environments.

Specifications

ASIN	B00EZB1QQ2
Best Sellers Rank	469,201 in DIY & Tools ( See Top 100 in DIY & Tools ) 4,380 in Sealers
Brand	FUAUFAS
Colour	Multicolored
Country Of Origin	USA
Customer Reviews	4.7 out of 5 stars 2,850 Reviews
Full Cure Time	10 Days
Full cure time	10 Days
Initial Hardening Time	7 Days
Initial hardening time	7 Days
Item Form	Liquid
Item Weight	10.2 Ounces
Item weight	10.2 Ounces
Liquid Volume	10.2 Fluid Ounces
Liquid volume	10.2 Fluid Ounces
Manufacturer	ASI
Manufacturer Part Number	ASI Aquarium Clear
Material	Silicone
Model Number	ASI Aquarium Clear
Number of Items	1
Surface Recommendation	Glass
UPC	802455893066
Unit Count	301.65 millilitre
Water Resistance Level	Waterproof

Reviews

T**Y

Good product

I used this to reseal my aquarium, did a really good job and is non toxic. Been holding well for months now.

30.08.2026

P**E

Good quality

Seems great it skins up nicely allowing time to work

17.10.2025

C**S

Excelente para peceras

Me sirvió perfecto para reparar mi pecera.

29.07.2026

#**S

Easy to use, seals well for 100gal

Worked awesome for resealing my 100gal tank. Took me 3 tubes, experienced peopley may need less 😂 Be sure surface is clean and use acetone to remove any residue BEFORE resealing. I followed all instructions and aquarium holds water perfectly

2.10.2026

F**G

Item well received.

Fast delivery. As per specified.

1.07.2022

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€ 66.80

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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