so... I think it works like this:

1. wet the plywood with PR - wait 24 hours

2. although thr PR layer is NOT dry, due to contact with oxygen, lay the FG on the wet/sticky PR, & then saturate the FG with more PR - wait 24 hours.

3. again, the PR will not be completely dry. mix wax/styrene with PR & paint over the wetted FG. - wait 24 hours. This time the PR WILL be completely dry, because the wax/styrene seals the PR from oxygen.

4. that last layer is going to be very very hard to sand. is that last layer what everybody call "gelkote" ?

or is the gelkote another layer over the wax/styrene/PR layer ?

or is gelkote a meterial that can replace the w/s/PR layer ?

what are the advantages/ disadvantages of epoxy over PR ?

why are we using epoxy ?

Is it just because epoxy is transparent ?

spidey - thx for your time.

I'm trying to create strategy for my next boat.

Erez