- 1). Open the fiberglass exterior door. Remove hardware from the door, using a screwdriver.
- 2). Abrade the fiberglass exterior door to promote surface adhesion by sanding it with 220-grit sandpaper.
- 3). Slide sheets of masking paper underneath the door. Tape the edges of the paper down with a low-tack blue painter's tape.
- 4). Fill a five-gallon bucket halfway with the primer. Apply a coat of acrylic latex primer to the abraded fiberglass exterior door, using a roller. Smooth the wet primer, using a four-inch paintbrush, manufactured specifically for use with latex paints. Wait two hours for the primed fiberglass exterior door to dry.
- 5). Clean your painting tools with water.
- 6). Coat the primed fiberglass exterior door with acrylic latex paint. Apply paint to the door just as you did the primer. Use a new nap roller cover.
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