: ...the
: only thing I can think of I did wrong was to add the hardener first; I
: mixed to the 5 and 15 lines where adding the resin first is mixing to the
: 10 and 15 lines which is always the way Ive done it before. I guess I just
: had the hardner bottle in the hand.

If you have two more of the same kind of graduated cup, check by pouring up to the 5 line three times on one cup, pouring into the second each time. You should be up to the 15 line. The graduations can be off quite a bit depending on where you got the cups. Any amount the graduations are off, it will result in much more error by pouring the hardner in first.

: ...It's a fill coat, maybe I can skim it off with acetone and steel wool?

A putty knife followed by solvent is less messy. One other thought. In your efforts to cure it with heat, you may have it softened by heat. Let it cool down before trashing it.

Al