1. Remove peeling or weakly attached layers of paint using a scraper.
2. Clean dust and dirt from the surfaces, using a dust brush. Remove resin from knot locations using a putty knife.
3. Clean surfaces with a cleaning agent, according to the instructions on the label. Carefully rinse the surfaces and let them dry.
4. Polish the old, strong layer of paint until it becomes matted, and then remove polishing dust with a brush and cloth.
5. Treat the cleaned knot locations with an insulation primer.
6. Prime the surfaces that have been cleaned to wood level with primer, diluting it with 5 % solvent.
7. Putty the uneven areas.
8. Polish the treated locations with sandpaper and remove the polishing dust with a brush and cloth.
9. Prime the treated areas with primer, diluting it with 5% solvent if necessary.
10. Paint the surface once or twice with paint. If necessary, dilute the paint with 10 % water.
11. Clean the tools according to instructions on the label.