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I don't know if this technique applies to the Jeffco sealer, but here's
what I did with the "old" PRC sealer. (I came up with this after numerous
trials and this worked the best:)

1. Paint the inside of the prepreg fuel bays with epoxy (I used
Safe-T-Poxy). Numerous pinholes will be evident at this point. Try and sop
up any puddles in the low spots while the stuff still flows.

2. When the first coat has almost lost its tack (after several hours), put
on a second coat. This one should have NO pinholes.

3. The next day, apply the primer and sealer over the epoxy (do NOT wipe
down with solvent first).

Sure, it adds weight to the wings, but so does fuel leaking into the wing
skin core thru a bunch of pinholes.

Sure, the epoxy may well crack over time, but you will have a CONTINUOUS
(no pinholes) rubberized sealer to seal the tank. The epoxy just provides a
good substrate for bonding the sealer.

(When I put the sealer right on the prepreg, I could just peel it off in
sheets.)

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