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Painting Door Casings & Trim

Question: We did bathroom renovation, built new baseboards but kept trim and casings. I sanded, primed and painted the trim and casings. The paint started bubbling up and peeling! I can see old varnish that adhered to the paint and pulled away. Not enough sanding apparently! Should I strip everything and start over or sand up to the large spots that seem to have adhered well?

Answer: If the bad spots are less than a third of the surface I would try to just sand the bad spots, however if it is any more than that I would sand it all down to the bare wood. It may be difficult to get the surface to match in paint thickness on the areas that you sand versus the ones you don't. You will have to feather the areas that are in good shape to try and get an even paint surface.