I deicded to test a coat of polyester resin on an old defretted fretboard of mine, I applied it last night, but it still hasn't hardened yet. The can doesn't say how long it takes to harden. I added enough hardener because the stuff I used to apply it and the container I had it in all hardened, but on the fretboard its just still kinda gooey? Anyone know if I did anything wrong or how long it should take? thanks.