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Common house painting problems include peeling paint, often caused by moisture or poor surface preparation. Blistering and bubbling can occur due to painting in humid conditions or applying paint over a dirty surface. Cracking and flaking result from using low-quality paint or skipping primer. Uneven coverage happens when applying paint too thinly or not using enough coats. Streaks and roller marks appear due to improper application techniques. Mold and mildew growth can develop in damp areas. Fading and chalking are common in exterior paint exposed to harsh sunlight. Proper preparation, quality materials, and the right techniques help prevent these issues.

To determine how much paint you need, start by calculating the surface area. Multiply the length by the height of each wall and subtract windows and doors. A gallon of paint typically covers 350–400 square feet per coat. For two coats, double the amount. Textured or porous surfaces require more paint.

For example, a 10×12 room with 8-foot ceilings has about 400 square feet of wall space, needing one gallon per coat. Ceilings, trim, and doors may require extra. Using a paint calculator or consulting a professional ensures accuracy, reducing waste and ensuring full coverage for a flawless finish.

Yes, using a primer is often necessary for a long-lasting, professional paint job. Primer helps seal porous surfaces, improves paint adhesion, and enhances color uniformity. It’s essential when painting over bare drywall, wood, or previously unpainted surfaces. A primer is also recommended when switching from dark to light colors to prevent bleed-through. Stain-blocking primers help cover water stains, smoke damage, or tannins in wood. If painting over glossy or oil-based paint, a bonding primer ensures adhesion. However, some high-quality paints include built-in primer, which may work for minor touch-ups on previously painted surfaces in good condition.