If your product is made from uPVC, you can buy a touch-up pen from our shop. You can use the pen to fix small scuffs or faded areas on mitre joints on a UPVC window frame. To find the best way to touch-up wood, aluminium, or composite materials, call customer services at 0800 988 9398. Or email [email protected] and a member of our team will help to arrange the next steps.