ORIGINAL: Richard L.
5-minute epoxy is not fuel proof. 15-minute epoxy is 50% fuel proof. 30-minute epoxy is 100% fuel proof. There is no need to thin the epoxy if you use either 30-minute or 45-minute epoxy.
My thinned 5 minute (actually 6 minute) takes over an hour to cure, and about 24 hours to harden. Does this qualify as fuel proof? Is it all in the cure time? You've got me worried now.