Can You Paint Over Existing Paint? A Pro's Rules

Can you paint over existing paint? Yes — in most cases, as long as the old surface is clean, dull, and sound. That's the short version. The longer version is that a few specific situations will make you regret skipping prep, and knowing the difference is what separates a repaint that lasts a decade from one that peels in a year.

When You Can Go Straight Over

If the existing paint is the same type (latex over latex), in good condition, and not glossy, you can usually clean it, let it dry, and paint. Walls that are intact, not peeling, and not high-sheen are the easiest repaints there are. A quick wash to remove dust and grime, and you're ready for color.

When You Must Prime or Sand First

Some surfaces will fight you if you paint straight over them:

• Glossy or semi-gloss surfaces — new paint needs a dull surface to grip. Sand it or use a de-glosser first.
• Oil over latex or latex over oil — these don't bond to each other without sanding and a bonding primer.
• Stains, water marks, or smoke — these bleed through fresh paint unless you seal them with a stain-blocking primer.
• Drastic color changes — going from dark to light (or vice versa) usually needs a primer coat plus two finish coats.