Thanks, guys.

So about getting an air barrier to promote curing...

Are there types of gelcoat that don't need this, or have the wax premixed? And as far as the wax goes, it 'knows' where the outside is, cuz it's 'downward' on this skeg repair.

Cellophane wouldn't work, cuz it would be disolved?

How do you seal airtight with aluminum foil? Tape the edges?

Ciao,
Danno