Tougher than nails
I am using Durabak on my 1967 Pontiac Lemans restoration on the both sides of the floor pan and wheel wells. I made the mistake of allowing O2 to remain in the can which turned the Durabak into an extraordinarily hard substance. If it holds up that well on the car it is well worth using this product. I recommend using something like Bloxygen in the can when storing. Keeps O2 out of the can.