Bruce on horizon wrote:
Check the expiration date on the gelcoat. It sounds like the mekp is not
curing the entire batch.

The odd thing is that it cures fine wherever it's over other gelcoat. I
have had this can for a while, so it could possibly be age related. I
could try another tube of MEKP, as I have a couple that haven't been
opened. I'll give that a shot tonight.