I had a professional painter come in and scrape/repaint the wooden exterior
window frames on my house when we bought it (2 years ago). I have now
noticed that several of the windows have litereally "let go" of the paint.
He used a solid stain product - not paint.

He came back happily last summer and touched up a few spots....but this is
silly. What can cause the stain to just let go? A few of the sills have
significant "raising" of the grain..... any ideas?

bmoney