Interior Painting Tips: How to Get a Professional Finish

Most homeowners know how to roll paint on a wall. What separates a professional result from an average one is everything that happens before the roller touches the surface. Prep work is where the job is won or lost. For bathrooms and kitchens, choosing the right paint formulation is just as important as technique.

Proper Surface Preparation

Fill every hole, crack, and ding before you pick up a brush. Use a lightweight joint compound for larger imperfections and a spackling paste for small holes. Sand everything flush after drying — run your hand along the wall with eyes closed to feel any ridges or hollows your eyes might miss. For larger holes or water-damaged areas, see How to Assess Drywall Damage: DIY Fix vs. a Pro Job before starting.

Wipe walls down with a damp cloth before painting. Dust and grease prevent paint adhesion, and both are present on most interior walls in amounts invisible to the eye. In kitchens and bathrooms, use a mild degreaser.

Primer: Don't Skip It

Primer is not just undercoat — it's adhesion promoter, stain blocker, and uniformity creator. On new drywall, bare wood, or surfaces with significant colour changes, primer is essential. On repaired areas, a spot prime before the full coat prevents 'flashing' — the dull patches where spackled repairs show through the finish coat.

Tinted primer in a colour close to your finish coat reduces the number of finish coats needed and improves colour accuracy.

Cutting In vs. Rolling

Cut in edges (corners, ceiling lines, trim) with a quality angled brush before rolling the field of the wall. Keep the cut-in wet when you roll — this blends the two applications before either dries, avoiding visible lines. Work in manageable sections: cut in one wall, then roll it before moving on.

Load the roller with enough paint to apply without going dry, but not so much that it splatters. A W or M pattern for the initial application, then smoothed out with overlapping vertical strokes, distributes paint evenly. Maintain a wet edge throughout to avoid lap marks.