How to Remove Old Paint from Drywall Before Repainting

Paint sticks best to a surface that's been properly prepared, and drywall is no exception. Old glossy paint, peeling sections, or thick buildup will cause your new coat to fail—it'll peel, crack, or refuse to adhere properly no matter how good your paint is. The work here isn't glamorous, but it's the difference between a paint job that lasts five years and one that lasts fifteen. Your move depends on what you're dealing with. If the old paint is in decent shape and relatively flat, you're sanding. If it's peeling, glossy, or textured, you're removing it first. Either way, the goal is the same: a smooth, dull surface that's ready to bond with primer and new paint.

1. Test Before You Commit. Run your hand over the wall. If the paint is smooth and doesn't flake, you're likely looking at a sanding job. If it's peeling, bubbling, or chalky—rub it with your fingers and see white residue—it needs removal. Check for gloss by shining a light across the surface; glossy paint reflects light and must be dulled before new paint sticks.
2. Seal and Ventilate. Remove furniture or move it to the center and cover with plastic sheeting. Tape plastic or drop cloths over baseboards, outlet covers, light switches, and ceiling trim. Close doors to contain dust, and open windows for ventilation—especially in bathrooms where moisture can linger.
3. Dull the Glossy Finish. Use a drywall sander (orbital or hand-held) with 120–150 grit sandpaper. Work in circular motions, keeping even pressure. Sand the entire wall or focus on glossy areas if the paint is mostly flat. The goal is a dull, uniform surface, not bare drywall. Use a dust vacuum or damp rag after sanding to clear all residue.
4. Remove What Won't Stick. If sanding alone won't work—paint is too thick, textured, or actively peeling—use a paint stripper (chemical or eco-friendly) or a drywall sander with coarser grit (80–100). Apply stripper per instructions and scrape away softened paint with a putty knife. For heavy texture, a wallpaper scorer helps chemical stripper penetrate. Work in sections to avoid dried stripper.
5. Level Every Imperfection. After sanding or stripping, examine the wall for divots, gouges, or holes. Fill these with lightweight joint compound (spackle) using a putty knife, overfilling slightly. Once dry, sand smooth with 180-grit sandpaper. In bathrooms, use moisture-resistant spackle to prevent re-cracking from humidity.
6. Seal Bare Drywall Now. If any drywall is exposed (not just sanded paint), apply a quality primer before painting. Primer seals the drywall, prevents bleed-through, and ensures even paint coverage. Use a primer-and-paint combo if the old paint is intact and sanded; use separate primer for stripped or repaired sections. One coat of primer is usually sufficient unless the wall was dark or stained.
7. Wipe Away Every Speck. Wipe down the entire wall with a damp (not wet) cloth or tack cloth to remove all sanding dust. Let the wall dry completely—at least 2–4 hours in normal conditions, longer in humid bathrooms. Do a final inspection with raking light to spot any missed sanding or repairs.
8. Two Coats, One Vision. Apply primer first (one coat), then let it dry per the can's instructions, usually 2–4 hours. Apply your finish paint in two coats, allowing drying time between coats. In bathrooms, use semi-gloss or satin paint for moisture resistance; flat paint will absorb humidity and grow mold.