ProSeal Instant Gas Tank & Radiator Repair, 1 oz – Steel-Reinforced Epoxy Putty, Permanently Seals Small Holes, Cracks & Split Seams, Adheres to Wet Surfaces

I've been dealing with a crack near the bottom of my fuel tank on my 79 Jeep J10 for a long time. I took the fuel down low so the crack would be dry. I cleaned it up with sandpaper and made sure it was dry. At first I thought this product was tough to knead, as it was but it's worth it. At first it seems like it's not bonding but over maybe 1 minute I could tell it was getting stickier and stickier. I got it where I needed it to be and wow was it clearly adhering. Not one drop has leaked through after setting. This is what I'll always use from now on. It shut down a full big crack completely. It is rock solid. Huge fan.

This putty is the best. I fixed a fuel tank leak. 2 hole I've repaired. Im widowed and have to do things on my own. It really works. Follow the instructions to the T.

Not hard to use, in the cold it will be hard to mix. Need to warm it up. Also has a tendency to stick to fingers as you apply it.

The only one that has worked for me on my motorcycle gas tank after I had tried like 5 different ones

It says that you can apply to wet will instantly seal leak Etc. Does not work does not seal the leak and does not stick. Complete waste of money and waste of time. If you do not clean the area perfectly probably will not work and may not even work then. Total crap don't buy

Not sure how other reviews got this to work on plastic, but it did not on mine. Maybe i didn't sand the plastic good enough, but since this dries hard as a rock i don't see it holding up on a lawn tractor tank with all the vibration it is subjected to. I'm giving it 3 stars because i don't believe it is meant for plastic and it was easy to work with. I think it will adhere to metal much better.

Worked great for 10 months

I had this on hand when I got a gas tank puncture on some road waste—Gasoline was leaking in a steady drizzle through a pea-sized hole under the back of my car. I mixed the putty as instructed, and pressed it firmly against and into the hole. Not only did the gasoline immediately stop spewing, but as advertised the patch was rock solid after just two hours. This is a permanent fix that has now held up fir several months without needing to apply another layer.