Since I started using the following method for applying to Wood wing skins I've found that there is no real need to seal the wood. I use a 3" plastic trim Paint roller to apply the Epoxy to the Skins. You can buy these in Most Home Centers . These little rollers have a Plastic Frame and come with a small plastic paint tray and cost about $3.00 . Replacement rollers are about $1.50/ pair. ( just make sure that you remove the roller from the frame before you leave the shop)
After mixing the epoxy I add some Phenolic Micro Balloons . This gives the resin some "color" and the Micro Balloons tend to get "Stuck" in the pores of the wood. After mixing the Micro Balloons , pour the resin into the tray and wetout the roller. Now just "Paint" the resin onto the skins. It takes about 60 seconds to do both top and bottom skins on 38" span wing panel . About 90 seconds for a 60" one. The roller makes it easy to get epoxy right to the edge of the skins. Have a pc. of cardboard handy and you will be able to "dry out" the roller on the cardboard and "suck-up" any excess resin from the skins.

Before you leave the shop pour out as much resin as you can from the tray . Let the rest just cure in the tray, and you will be able to reuse the tray over and over.

Jim Bonk