Roll On a Skim Coat to Get Plaster-Smooth Walls Without a Plasterer

The Problem

Textured, tired, or patchy walls put a ceiling on how good a paint job can look — no sheen and no number of coats will hide a surface that isn't flat. Full replastering means hiring a plasterer and living with the disruption, which is why most people paint over the texture and accept the result.

The Technique

A roll-on skim coat gets a decorator's finish out of materials you can apply with a roller.

1. Sand the wall with 80 grit to knock off high spots, old drips, and loose texture.
2. Thin the filler. Roll-on skim coat straight from the tub is usually too thick. Add a splash of water and mix thoroughly until it's the consistency of a thick paint. This step has an outsized effect on how smooth the finish ends up.
3. Roll one small section at a time with a skim-coat roller. Covering the whole wall before flattening guarantees the first part sets before you reach it.
4. Flatten each section with a skimming blade — steady, even pressure. Don't chase perfection at this stage; the sanding pass is what delivers the final flatness.
5. Overlap into the previous section as you move along, keeping a wet edge exactly as you would with paint.
6. Let it dry fully, then sand with 180 grit.
7. Hunt the imperfections with a bright inspection light held close and raking across the wall. The light throws shadows off flaws you cannot see straight-on. Fill whatever it finds, sand it smooth, and check again — repeat until the light stops finding things.
8. Prime the whole wall to even out the surface's absorbency, then apply two topcoats.