If you’re planning a fiberglass repair or touch-up paint project, the success of your repair will depend upon how well you prepare the surface you are working on, any dirt or stain material not removed could ruin the job. For scratches or gouges, cautiously water sand the area and be sure you’ve removed any sharp scratches or edges. Prepare the area by cleaning it with a product like alcohol or WD-40 to remove grease, oil or stains from rollers. Wash away any cleaning materials and dry thoroughly.
Mix a patch color on a test area to determine a color match. Once you have selected the right color, place the patch material on the area, be cautious not to use too much. When the damaged area is covered, take a piece of wax paper or cellophane and place the paper over the patch and gently smooth it out to remove any thick spots. Allow the repair area to dry completely. When dry, gently remove the paper. You should see an overall smooth, matching repair.
If you are making a paint touch-up, be sure you have selected matching paint. If working outside, it’s best to wait for a day without wind or locate a protected area to work. Clean the surface thoroughly, sand it if necessary and place paper well outside the area to be painted to catch any overspray. Be careful not to overspray the paper.
Once the area is dry, carefully remove the paper with the overspray and very lightly water sand if needed.
When making glass repairs or painting, it’s easier to spray additionally after the area dries than it is to remove excess paint. That becomes a whole new job