- Confusion? Yes. I went to the source. Sorted. Instantly.
The first book of Payson (1979) doesn't spell out the ins and outs
of the different resins, just showing how to apply glass tape to the
chines. It does say there is never any problem with bonding glass to
plywood (except spruce), and that epoxy is reliable and easy to mix -
9 refs for: Epoxy (resin); Fibreglass; Glues.
The second book of Payson (1984) has it all. Check the index again:
12 references for Epoxy; resins, Polyester; Fibreglass;
Fibreglassing plywood; Glass taping. Page 15 particularly for
polyester curing re: air and added wax (that there are both
polyester resins with wax and those without isn't very clear, but it
is implicit on reading closely and he advises following label
instructions). "Bondo" is discussed.
What's the third book of Payson got? We'll see soon. The extra cost
of epoxy over that of polyester may have been even greater back in
1983. If that was the decider, and it's eased a bit now, then for
simplicity and clarity maybe Dynamite will mention only epoxy. Jim
Michalak mentions only epoxy in his 2002 book, though elsewhere he
says he personally uses cheap "Bondo", and other polyester resins
with no problems having showed over time.
It seems in 1984 Dynamite only uses epoxy as a wood sealer (or
polyester; the epoxy is better) and for glueing styrofoam (it
doesn't react and eat the foam like polyester does).
He writes on glues and sealers: "What's the matter with epoxies,
resorcinols, and all the other wonder glues? Nothing except the
price. And if you want to use a $40 bucket of glue when a $10 bucket
will do the job, go ahead"