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 your aquarium like a pro — strong, safe, and splash-ready!

FISH FRIENDLY FORMULA - Non-toxic when cured, ensuring a safe environment for your aquatic life.
FRESH SALTWATER READY - Formulated specifically for both freshwater and saltwater aquariums and vivariums, making it the go-to sealant for all aquatic projects.
UNBREAKABLE AQUARIUM BONDS - High modulus RTV silicone creates strong, primer-free adhesion to glass for lasting durability.
VERSATILE TEMPERATURE TOLERANCE - Works from freezing -18°C (0°F) to scorching +50°C (120°F) during application and withstands extreme temps up to 233°C (450°F) after curing.
PRECISION APPLICATION WITHOUT MESS - Non-slump formula allows clean, vertical surface application without sagging or dripping.

Midwest Hearth Clear Aquarium Silicone Sealant is a high-performance RTV silicone designed for aquarium construction and repair. It bonds glass without primers, cures to a fish-safe, waterproof seal, and withstands extreme temperatures. Its non-slump formula ensures clean vertical application, making it ideal for fresh and saltwater tanks. Fully cures in 7-10 days, providing a durable, long-lasting seal that keeps your aquatic environment secure.

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Color	Clear
Brand	ASI
Item Weight	10.2 Ounces
Liquid Volume	10.2 Fluid Ounces
Full Cure Time	10 Days
Item Form	Fluid Oz
Surface Recommendation	Glass
Water Resistance Level	Waterproof
Number of Items	1
Manufacturer	Gordon Glass Co
UPC	802455893066
Unit Count	10.2 Fluid Ounces
Material	Silicone
Part Number	ASI Aquarium Clear
Item Weight	10.2 ounces
Package Dimensions	9.09 x 2.48 x 1.81 inches
Item model number	ASI Aquarium Clear
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Special Features	Strong
Batteries Included?	No
Batteries Required?	No

Midwest Hearth Clear Aquarium Silicone Sealant - 10.2 Fluid oz Cartridge

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