Repainting Interior Windows Cornwall

Is It Worth Repainting Rather Than Replacing?

For timber window frames in sound structural condition — no rot, no broken joints, glass well-sealed — repainting is almost always the right choice. Replacement windows are expensive, disruptive, and in older Cornish properties you may lose character that’s hard to get back. A properly painted timber frame can last another decade before it needs attention again.

What You’ll Need

Step-by-Step Guide

1. Protect the room Lay dust sheets under each window. Remove items from sills. Condensation drips from frames during prep are common — cover properly.
2. Clean the frames thoroughly Mix sugar soap with warm water and wash every surface you’re painting. Remove grease, dust, condensation residue, and any mould spots (treat mould with diluted bleach first, then clean with sugar soap). This step dramatically improves adhesion.
3. Sand down the existing paint Use 80-grit to key the surface — you’re not stripping, just giving new primer something to grip. Sand along the grain. Remove any flaking sections completely. Finish with 120-grit, wipe away all dust with a damp cloth.
4. Fill and repair Fill cracks with wood filler, allow to cure, sand smooth. If there are gaps around the frame where it meets the wall, run a thin bead of flexible caulk along the join, smooth with a damp finger, and allow to dry.
5. Mask the glass Apply masking tape along the glass edge where it meets the frame, leaving a 1mm gap so paint seals against the glass (helps prevent moisture getting under the edge).
6. Prime bare wood Any areas sanded back to bare wood or filled with filler need a coat of wood primer. Apply, allow to dry, lightly sand with 120-grit before topcoating.
7. Apply first topcoat Use a 25mm angled brush. Dip one-third of the bristles, wipe off excess on the tin rim. Work in long smooth strokes along the grain. Start at the innermost sections (nearest the glass) and work outwards. Thin coats beat thick coats every time.
8. Allow to dry fully — don’t rush it Follow the manufacturer’s drying time. In a cold or damp Cornish room, add time. The surface must feel completely dry and non-tacky before recoating.
9. Second coat and finish Lightly key the first coat with 180-grit (barely any pressure — just flatten dust nibs), wipe clean, apply second coat. Once dry, remove masking tape slowly at 45°. Use an artist’s brush to touch up any bleeds.

Common Mistakes to Avoid

• Painting over dirty or greasy surfaces — the paint will peel within months regardless of quality
• Skipping primer on bare wood — unprimed wood absorbs topcoat unevenly, leaving a patchy finish
• Rushing between coats — soft paint underneath causes the topcoat to wrinkle and crack
• Too much paint on the brush — drips are nearly impossible to fix invisibly once dry
• Painting sashes shut — keep sash windows moving throughout to prevent them sticking

Summary

The most important steps aren’t the painting — they’re the cleaning, sanding, and priming that happen first. Get those right and the painting itself is straightforward. Rush the preparation and no amount of expensive paint will save you. If you’d rather have it done properly in a day, Pinder’s Painters are happy to help.