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Paint bubbles or blisters will occur if the top coat of paint doesn’t properly adhere to the undercoat, often as the result of a moisture or heat problem. If you notice these unsightly sections, first identify the underlying cause, especially if it's a temperature issue, before you move on to fixing the finish. Once the basic problem has been addressed, scrape the bubbles and blisters off with a paint scraper, and sand smooth. Coat with primer before repainting.
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