I use the great planes 6 minute and 30 minute stuff. I really like the gp 30 minute stuff because I can mix it in the little plastic cups u get from the pharmacist and I can mix the snot out of it without it acting like 5 minute stuff and curing in a blaze. Some 30 minute stuff (hanger 9) will cure stupid fast if it is stirred to quickly.

For fuel proofing I use zpoxy with a brush and wipe most of it off with a rag. Any thing that needs strength I use the gp 30 min stuff.