Fresh paint applied in direct sunlight, and moisture, causes paint to blister. Surfaces that are heated by the Sun and become hot can prematurely dry new paint, causing blistering. This is more common with dark or dramatic colors because they, in addition to surfaces, absorb heat. Heat blistering will have a layer of paint under the blister if the surface is being repainted. Trapped moisture in walls or behind surfaces will eventually try to escape through painted surfaces, also causing blistering. Moisture blistering will reveal a bare surface under the blister. Blistering surfaces should be scraped and sanded smooth, primed with a top quality alkyd or acrylic latex primer, and finished with top quality acrylic latex finish paint. If moisture blistering occurs on a repainted surface, spot priming of bare spots will be necessary to ensure a uniform and even finish before the final priming and painting is completed.