....I mixed up a batch of 5-min epoxy, and dumped it into
the fire-wall area, and kept turning the fuse around till
it hardened. I got it real good inside there before I put
the tank in.

I also went all around the wood in the main cabin area, and epoxied the heck out of the wood-meets-fiberglass areas.
Then I used a thinned coat of epoxy on all the wood for
fuel proofing....

I'm sure I added a couple oz's of wieght, but I like "stout".
The retract areas were just fine.....