Paint New Siding Quickly To the Editor: Bill Feist's article on paint (9/99) understates the effect of sunlight on paint adhesion. His book, Finishes for Exterior Wood, helped me determine why the paint was falling off a new house we recently built. The unprimed cedar was in sunlight for a month before we could paint it. His research indicates that cedar loses half its ability to hold paint every two weeks! Other woods don't fare much better. I think his book is a "must read" for builders and painters. Unfortunately in our situation, we had to re-side the entire house to fix the problem. Tom Payne Craftsman Homes Group Portland, Ore. Ridge Vents vs. Gable Vents To the Editor: The response by