How to prepare walls for painting without unnecessary rework
A good finish does not start with the roller. Here is the surface preparation that has the greatest impact on the final wall.
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Step 1. Check the old coating is sound
New paint needs a sound substrate. If the old layer peels, blisters, or crumbles, weak areas must be removed and repaired before painting. Covering a failing surface with a new coat only hides the problem; it does not repair it.
Step 2. Clean the wall
Dust, grease, and dirt interfere with adhesion and can show through the finish. Pay particular attention to kitchens, areas around switches, and places frequently touched by hand. After damp cleaning, let the substrate dry completely.
Step 3. Repair defects
Fill holes, cracks, and visible dents with a suitable repair compound and level them after drying. Imperfections are easier to see in side lighting, which makes it a useful final check before painting.
Step 4. Dull overly smooth or glossy surfaces
Smooth glossy coatings may need sanding or special preparation so the next coat can bond reliably. The exact method depends on the old coating and the new system, so follow the manufacturer’s instructions.
Step 5. Remove sanding dust
Sanding dust can ruin the uniformity of the coating. Before priming or painting, the surface must be clean and dry. Do not rush to cover defects with paint; inspect the wall first in daylight and side artificial light.
Step 6. Decide on primer
New porous plaster, spot repairs, major color changes, and troublesome stains are typical cases where primer is especially useful. For difficult substrates, choose the system according to the technical recommendations for the specific paint.
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