Yes it resists fuel and solvants! It also "works on radiators, batteries, manifolds, AC lines, engine blocks.It bonds aggressively to most surfaces, including, metal, plastic, fiberglass, ceramic, glass, wood, etc. After 1 hour it can be drilled, tapped, machined, filed, sanded and painted." This stuff is a putty , you cut off what you need and role it in your hand untill it is one color, then mold it on. I had a leak around the soldered panel on my tank, and used this stuff, and it has not leaked since.