I have a half-full warehouse of unresined peps and they're OK. I try to make sure they are well supported and reinforced. What I have started doing is giving them two coats of resin on the outside, using left over resin from other pep projects. The second coat really stiffens it up much more than the first one alone. Then I wax the inside of the pep with car polish paste - cheap stuff works fine - and if you use rondo on the inside of your pep before fibreglassing, the card peels off like you wouldn't believe. Anyway, got off topic, but back to your original question - they'll be fine until you get round to resining them. Cheers!