1. Remove peeling or weakly attached layers of varnish 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 varnish 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 paint, diluting it with 10% water if necessary.
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 surfaces with primer. If necessary, dilute with 5% solvent.
10. Paint the surface once or twice with paint.
11. Clean the tools according to instructions on the label.