Will yhis work on the bottom of a black water tank?

We used it to repair a separated seam on the drinking water tank for our camper. I don’t see why it wouldn’t work for your application. It’s held for a solid year, with several uses.

My coolant tank isn't cracked but has that white spiderweb look on the top near the cap, would this cover that section, to prevent it from cracking?

I think so. My tank had a small hole and it was very brittle in the area with cracks and it has done just fine for several months now. Much cheaper than paying $100 bucks for OEM tank.

Will this work on rubber?

Does it say it works on rubber? If it does then yes otherwise buyer beware. Please read shut the product uses and descriptions before asking this type of question.

Which is the best sealent for stopping leakage in sintex water tank

I ended up using gorilla glue, it was easy to apply and leaves a clear watertight seal. Remove the tank, drain it, wash it well with soap and water, dry it well, apply gorilla glue to the cracks and let dry, then water test before you reinstall the tank. Easy, clean and works great, has lasted over two years since I repaired.

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🛠️ Fix it fast, fix it right — don’t let leaks slow your flow!

RAPID CURE TECHNOLOGY - Hardens in 8-10 minutes and fully cures in just 30 minutes to get you back on track fast.
DURABLE WEATHER RESISTANT - Engineered to perform reliably in typical garage temperatures (50-75°F) for lasting results.
PRECISION CRACK HOLE REPAIR - Fix cracks up to 4 inches and holes up to 0.375 inch with professional-grade resin.
UNIVERSAL FIT FOR PLASTIC TANKS - Designed for windshield washer reservoirs, radiator overflow, coolant, water, and waste tanks.
USER FRIENDLY WITH VISUAL GUIDANCE - Step-by-step instructions with photos make repairs foolproof, even for first-timers.

The Permatex® Plastic Tank Repair Kit is a professional-grade solution designed to repair cracks up to 4 inches and holes up to 0.375 inch in various plastic tanks. Featuring a fast-curing resin that hardens within 10 minutes and fully cures in 30, this kit includes all components and easy-to-follow photo instructions for quick, durable repairs. Ideal for use in moderate temperatures, it’s perfect for windshield washer reservoirs, radiator overflow, coolant, water, and waste tanks (excluding plastic fuel tanks).

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€ 85.86

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Item Weight	227 g
Fuel Type	Petrol
EU Spare Part Availability Duration	1 Years
Fit Type	Universal
OEM Part Number	PX09100
UPC	077349611556
Manufacturer	Permatex
Model	09100
Product Dimensions	2.74 x 17.04 x 8.64 cm; 226.8 g
Item model number	9100
Manufacturer Part Number	PX09100
Outer Material	plastic
Colour	No Color
Assembly Required	No
Country of Origin	USA

Permatex® Plastic Tank Repair Kit

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