Fiberglass garage doors – Firstly, because fiberglass is nonporous, you must slide it to promote adhesion, or the finish will peel. In addition, because glass is so smooth, you will need to apply the paint in a certain way that will promote a professional looking finish, free hanging and brush strokes
Paint a fiberglass garage door, clean fiberglass garage doors with a pressure washer. Allow the fiberglass garage doors to dry. Stop sanding when the fiberglass garage doors feel a little rough. Cover parts of the garage door; you do not want painted with blue painter’s tape. Open the garage door and push heavy fabric drop cloths underneath. Close the fiberglass garage doors.
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Smooth the wet primer using a 4-inch brush made for latex paint. Continue the application process until the glass is completely coated with primer. Allow the door to dry for two hours. Wash brush with plain water. Apply a coat of exterior acrylic latex paint in the same way you apply primer. Allow the door to dry for two hours. Be sure to raise the garage door a few inches until the seams open a little, or garage door could be closed. Do not start pressure washer on a high setting or you may damage the fiberglass garage doors. Do not use sandpaper with a grain is lower than 300, or you can mar the glass with scratches, which can be seen through in the final finish.