2 seasons ago i tried something new on my boats. i seal the inside with bob smith finishing epoxy, because it's most hobby shops "store brand", it's inexpensive, & because i can't see inside sponsons and such i trust the strength of epoxy. on the outside i have been using deft brand lacquer based sanding sealer. it's a clear primer/SEALER for wood. goes on like water, soaks in very well & dries for sanding in about 1/2 hr. sands like any normal primer. 2 coats of that, then paint or clear. much easier, quicker & cheaper than epoxy. it's available in 1 qt. cans or spray bombs at lowe's. i've used it on 4 boats with no issues so far, & still have more than 1/2 the can left. any lacquer based paint will work over it & automotive base/clears will also. as a test, i sealed a small peice of plywood with it, submerged it in water for 2 days. came out just like it went in, no water soaked in past it, none of it has discolored either. for those of you that have seen my jae .21, this is how it's finished. used lustercoat clear over it. the can says good up to 25% nitro, but if you let it cure for a couple weeks before exposure to nitro, i use 65% with no issues. costs me about $15 to finish a .21 boat B) ........