My husband did a good job painting the interior of our new home. Unfortunately, when it came to our built-in bookshelves, I don't think he primed over the other semi-gloss when painting with the new semi-gloss white paint. When we put the books in, the paint is peeling off in sheets. How can we fix this? Do we have to strip? Any way to avoid sanding? Any and all advice would be much appreciated.