I helped a friend apply gelcoat
to his dinghy
a week or two ago. We added MEKP at 1% at about 88 degrees air temp. The gelcoat
hardened enough that you couldn't put a thumbprint in it within an hour or so.
I thought this was waxed gelcoat but now I'm wondering if it really was, because I came back a week later to help sand it up, and the gelcoat, despite being firm to the touch, is just gummy enough to load up and quickly ruin any sandpaper you try to use on it.
Is there anything we can do (now that it's a week or two later) to try and make it harden better? Would spraying pva on it help at this point or is it too late? What about adding a thin layer of waxed gelcoat on top (I'd rather not add much because it's really already the ideal thickness).