The resin got hard enough that I could sand on it, so I decided to call it good and use the part. It's not structural anyway. I mixed up a bit more resin and finished saturating the glass that wraps around the edges (pictures next post) and got started on the other side. If all goes well, should be doing body filler and primer in the next week. I don't expect I'll get much done over Turkey Day weekend.
Oh, I found that epoxy resin does not seem to loosen masking tape along the edge of fiberglass... it might be different with polyester resin, but all the bits of tape I used on this piece are a part of it now. :`}
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