Although they are designed to last for a long time, you can increase and prolong the longevity of your VELUX Windows using the VELUX Window Maintenance Kits. With the VELUX Repair kits, you can repair scratches and touch up the roof window. VELUX have 3 different repair kits - one for Pine roof windows (ZZZ 176) , one for PU Windows (ZZZ 129) and one for White Pine (ZZZ 130) - as well as a care kit for your white pine window to help maintain and prolong its longevity.