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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🐠 Seal the deal with confidence—your aquarium’s best friend!

DIY REPAIR HERO - Easily repairs old or damaged tanks, saving your investment and keeping your fish safe.
TEMPERATURE WARRIOR - Withstands extreme temps from freezing cold to scorching heat, perfect for any environment.
READY FOR FRESH SALTWATER - Formulated to perform in both freshwater and saltwater tanks, ensuring versatile use.
NO SAG PRECISION APPLICATION - Applies smoothly on vertical surfaces without dripping or sagging—flawless every time.
UNMATCHED AQUARIUM GRADE SEAL - Creates durable, non-toxic bonds that keep your aquatic world leak-free and thriving.

Midwest Hearth Clear Aquarium Silicone Sealant is a high modulus RTV silicone designed specifically for aquarium use. It bonds strongly to glass without primers, remains non-toxic to fish after curing, and resists continuous water immersion. Its no-sag formula applies cleanly on vertical surfaces and endures extreme temperatures from -70°F to 450°F. Ideal for fresh and saltwater tanks, it also serves as a reliable repair sealant, ensuring leak-proof, long-lasting aquatic environments.

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Manufacturer	ASI
Part number	ASI Aquarium Clear
Item Weight	289 g
Package Dimensions	23.5 x 7.8 x 7.4 cm; 289.17 g
Item model number	ASI Aquarium Clear
Colour	Multicolored
Material	Silicone
Item Package Quantity	1
Special Features	Non Toxic, Strong
Batteries included?	No
Batteries Required?	No

Midwest Hearth Clear Aquarium Silicone Sealant - 10.2 Fluid oz Cartridge

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