When the epoxy is faired ready for gel coat,
paint on a layer of unwaxed vynal ester resin.
It will bond with the epoxy but wont set up hard unless you exclude oxygen from the surface.
This is good because you can reactivate a tacky surface with an acetone wipe up.
Problematic if you need to sand it as it clogs the paper.
Two or three weeks seems to be the limit for reactivation but a couple of days is better.
Now apply your standard poly ester waxed gel coat which will physically & chemically bond with the vynal ester and dry hard ready for polishing.
This avoids using epoxy based flow coats which are expensive and problematic in application and longevity (UV yellowing) or the limited colour range of hard to find vynal ester gel coats.
P.S. Whilst Bote Cote is formulated for wooden boat construction it does have other uses and advantages. Indefinite shelf life, non blushing, easy mixed in small or large batches, various speed hardeners including a UV stabilised non yellowing hardener and viscosity modifiers claiming low toxicity.
The mixed resin is quite viscous which means wetting out a lamination requires good technique.
For filleting and fairing it produces a stiff wet mix offering superior adhesion and sag resistance
The strength numbers stack up close to high performance high strength resin bases whist maintaining laminate adhesion when repeatedly flexed.
The
price is good
I have no affiliation with Boat Craft Pacific other than being satisfied with their products.