with the weather you have in Hoquiam, you should use a solvent based preservative. There is a product called "Sun Frog" that I have used on really porous woods (cedar and fir) and had really good luck with. But you can't paint over it very well as the paint falls off and wont stick.
The wood on my '35 is painted black with a tarry oil type preservative everywhere except the door jambs which are painted body color. It was painted in 1960 and is still in great condition - nearly all the wood is original. The truck has not been outside in the weather for about 40 years except to drive it.
Ken
