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.

ASIN	B0007TQWM4
Best Sellers Rank	#20,758 in Automotive ( See Top 100 in Automotive ) #14 in Motorcycle Tanks & Accessories
Brand	Permatex
Brand Name	Permatex
Compatible with Vehicle Type	Car, Truck, Boat, Trailer
Customer Reviews	4.0 out of 5 stars 426 Reviews
EU Spare Part Availability Duration	1 Years
Exterior Finish	Plastic
Exterior finish	Plastic
Fit Type	Universal
Fuel Type	Gasoline
Item Dimensions	6.6 x 10.2 x 20.3 centimeters
Item Weight	91 g
Item dimensions L x W x H	6.6 x 10.2 x 20.3 centimeters
Item weight	91 g
Manufacturer	Permatex
Manufacturer Part Number	PX09100
Material	Plastic
Material Type	Plastic
Product Grade	like new
UPC	077349611556
Unit Count	1 Count
Vehicle service type	Car, Truck, Boat, Trailer

Permatex 09100 Plastic Fuel Tank Repair Kit

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