When paint begins to bubble and chip away form a door, it’s frequently a fantastic idea to strip it until you repaint the door. That helps to ensure that old paint will not continue to flake off and ruin the new end. If the door is made of fiberglass, it is possible to strip with a chemical stripper as you would if the door were made of wood. The stripper should have a methylene chloride base, and you can not let it sit for too long, or it may hurt the fiberglass. Additionally, it is important to replenish the surface immediately after stripping.
Pull the hinge pins, remove the door and lay it flat on a pair of sawhorses. Unscrew the doorknob, latch and any other hardware with a screwdriver, and remove it.
Divide the door into quarters and strip each quarter separately so the stripper doesn’t remain in contact with the fiberglass for very long.
Paint methylene chloride-based stripper with an old paintbrush. Avoid stronger, more caustic products, since they will most likely damage the fiberglass. As soon as the paint begins to soften, scrape it off with a putty knife.
Wipe each part with a rag dampened with denatured alcohol once you strip it to replenish the stripper. If there is still an appreciable quantity of paint left over the surface, spread a little more stripper on it, and scrape the paint off when it softens.
Use a scouring pad soaked with denatured alcohol to get paint out of tight corners or out of molded edges.
Wipe the entire door with a rag moistened with denatured alcohol once you’ve completed stripping both sides. Wipe again with a dry rag, and in the event the rag picks up any residue, wash out the door again with alcohol. Continue brushing until the dry rag doesn’t pick up any residue.