High Quality Primer(nobodies mentioned Primer) of the same make of the paint you're going to use will be a great investment. Don't mix'n match the primer, because every manufacture uses different catalysts and hardeners(or different ratio's at least). Dupont paints are durable, and even more so with a few coats of clear. But if your base isn't solid, gas won't matter if a stone will take out a chunk of it.
just my $0.02. gl.