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.

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Midwest Hearth Clear Aquarium Silicone Sealant - 10.2 Fluid oz Cartridge

Midwest Hearth Clear Aquarium Silicone Sealant - 10.2 Fluid oz Cartridge

Product ID: 259861724

Details

Brand
Midwest Hearth
Colour
Multicolored
Full cure time
10 Days
Item weight
10.2 Ounces
Liquid volume
10.2 Fluid

💧Waterproof & fish-safe

🧊Wide temp range -57°C to +233°C

🧱High modulus strong glass bond

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C$3538

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐠 Seal the deal with crystal-clear confidence!

FISH SAFE NON TOXIC - Fully cured sealant is safe for fish, so your underwater ecosystem stays healthy and vibrant.
EASY REPAIR MAINTENANCE - Perfect for building or repairing aquariums with a smooth finish and reliable bonding every time.
NO SAG VERTICAL APPLICATION - Non-slump formula lets you seal vertical glass surfaces cleanly without mess or drips.
UNMATCHED AQUARIUM DURABILITY - Formulated for fresh & saltwater, ensuring long-lasting, leak-proof seals that keep your aquatic world thriving.
EXTREME TEMPERATURE RESILIENCE - Works from freezing -18°C to scorching +50°C during application and withstands -57°C to +233°C after curing.

Midwest Hearth Clear Aquarium Silicone Sealant is a premium RTV silicone designed specifically for aquarium glass bonding. It forms strong, waterproof, and fish-safe seals that resist continuous water immersion and extreme temperatures. Its non-slump formula allows precise vertical application without sagging, making it ideal for both new aquarium construction and repairs. Fully cures in 7-10 days, ensuring a durable, non-toxic environment for aquatic life.

Specifications

ASIN	B00EZB1QQ2
Best Sellers Rank	#80,662 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #186 in Silicone Sealers
Brand Name	Midwest Hearth
Color	Multicolored
Customer Reviews	4.6 4.6 out of 5 stars (2,805)
Full Cure Time	10 Days
Initial Hardening Time	7 Days
Item Form	Liquid
Item Weight	10.2 Ounces
Liquid Volume	10.2 Fluid Ounces
Manufacturer	Midwest Hearth
Material Type	Silicone
Model	ASI Aquarium Clear
Number of Items	1
Part Number	ASI Aquarium Clear
Surface Recommendation	Glass
UPC	802455893066
Unit Count	301.65 Milliliters
Water Resistance Level	Waterproof

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