1. Treat mouldy, blackened or blueish surfaces with a solution of the appropriate agent according to the instructions of use.
2. Impregnate the entire surface with an impregnating agent.
3. Remove resin from knot locations using a putty knife.and treat the knot locations with knot varnish.
4. Prime nail heads or other metal parts with a metal primer or other suitable anti-corrosion primer.
5. If necessary, putty the uneven areas in the internal edge of the window.
6. Polish the treated locations with sandpaper and remove the polishing dust with a brush.
7. Prime the entire surface with a paint that has been diluted with 5 % water.
8. Apply a thin layer of paint to the surface 1-2 times.
9. Clean the tools according to instructions on the label.