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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.

Paint itself isn’t necessarily bad if you see bubbles, but bubbling signals a problem with how the paint is adhering to the surface. Left unaddressed, these bubbles can burst and cause peeling or flaking, which compromises the appearance and durability of the finish. In some cases, bubbling can reveal deeper issues like moisture damage or surface contamination. If bubbles form during application, fix the underlying cause before repainting for a lasting, smooth result.

You can technically use wall paint on a ceiling, but it’s not ideal. Wall paint is thinner and more prone to dripping, which makes it harder—and messier—to apply overhead. Any significant level of sheen can highlight ceiling imperfections and create glare from lighting. Flat ceiling paint is the better choice for a smooth, even finish that hides flaws.

Yes, you can paint a flagstone patio, but ensure you choose a durable latex paint specifically designed for outdoor use and heavy foot traffic. An elastomeric latex paint will fill in all the gaps and create a waterproof seal over the stone. Even the best products made for foot traffic can last for one to two years, on average, so be prepared to reapply paint regularly.