If you want to paint a fiberglass garage doors, it will have to employ specific strategies of preparation and application. First, because fiberglass is non-porous, it has upper rough side up to promote adhesion, or finish will peel. Also, because fiberglass is so soft, you will need to apply paint in a particular way to promote a professional-looking finish, free from sagging and brushwork.
Sand fiberglass to promote adherence by sanding with a palm sander stocked with sandpaper fine grain. Stop sanding when garage door feels a little rough. Parts cover garage door that does not want to paint with blue painter’s tape. Open garage door and slide fabric dust sheets High resistance below it. Close garage door. Apply a light coat of acrylic latex primer to 90 cm (3 feet) wide section of fiberglass garage doors using roller. Smooth wet primer using a 10 cm (4 inches) brush made for latex paints.
Continue application process until glass fiber is completely coated with primer. Raise garage door about 8 cm (a few inches) until slightly open seams. Allow door to dry for two hours. Rinse brush under running water. Apply a coat of acrylic latex paint outside in same way to priming. Open garage door a few inches to seams open slightly. Allow fiberglass garage doors to dry for two hours.