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Bubbles can appear during painting for several reasons, but poor adhesion or trapped moisture are the most common. Painting over dirty, wet, or improperly prepared surfaces leads to air or moisture getting stuck under the paint layer. Using the wrong tools, applying paint too thickly, or working in extreme temperatures and humidity can also cause bubbling. In some cases, incompatible layers of old and new paint types, like latex over oil-based, create tension, leading to blisters and bubbles.

While DIY is possible, professionals ensure proper adhesion, even coating, and the use of high-quality, weather-resistant paints.

Painting over polyurethane without sanding is not advisable. Sanding, followed by priming, is pivotal in ensuring proper adhesion of the new paint. Sanding creates a rough surface that allows the primer to adhere firmly, which helps paint cure correctly, providing a long-lasting and smooth finish. Neglecting thorough sanding, followed by a paint primer, could lead to the paint not adhering effectively, causing peeling or uneven application.

Once you prep a house for exterior painting, painting with a sprayer can go quickly. Spray painting results in a thin layer of paint, likely taking multiple layers to get full coverage. You can expect the spray paint job to take at least one day, including dry time, but it can take longer depending on how large of a home it is and the weather conditions.