RE: West Systems epoxy
I use West systems and the pumps they sell works great thinned with lacquer thinner and it works great nice hard surface, i have never had an issue with getting the mix right the pumps do it for me thinning help flow the product out i fill the weave with building primer.
Water based polyacrlic works great too I have a 60 size F4U-1 where weight is a big problem and the process with WB poly works great however the surface is alittle softer when completed so be very careful with the finished plane...
my .02 cents