Most RV bodies are made primarily of fiberglass, a lightweight, durable material that doesn’t rust like metal. Recreational vehicles spend many hours on the road, and roof damage can occur over time. This requires repair as soon as possible to avoid water damage inside the RV. Fiberglass can be restored to its original strength using layers of reinforced fiberglass mat that is saturated with a catalyzed resin. When done correctly, a repair will last as long as the surrounding fiberglass.
Step 1: how to repair glass
Put on a respirator and safety glasses. Grind directly over the damage with a dye grinder until all frayed and damaged material is smooth, forming a groove in the fiberglass. Gradually cut down the walls of the grove to give the repair a maximum amount of surface to bond.
Step 2: repair fiberglass
Clean the surface of the repair area with a rag and acetone. Remove all dust and any other residue that may be on the surface.
Step 3: fiberglass roof
Tear the first layer of fiberglass matting to fit the bottom of the grove in the damaged area. Make each next layer 1/2 inch larger than the last to follow the conical shape of the grove. Use as many coats as necessary to return the damage to its original thickness.
Step 4: repair fiberglass ceiling
Put on rubber gloves and add catalyst to a small bucket of resin, following the recommendations on the containers. Stir the catalyst into the resin well with a stir stick.
Step 5: how to repair fiberglass
Dampen the surface of the grove with the resin mixture, using a 4-inch felt roller. First apply the smallest layer of mat to the grove and saturate it with resin, using the felt roller. Remove air bubbles that are trapped under the carpet, using an air roller. Repeat this process for each coat until the repair is flush with the surrounding fiberglass. Allow the repair to harden.
Step 6: repair with fiberglass
Sand the repair surface smooth with 200-grit sandpaper on a sanding block. Sand the repair until it is level and the edges blend into the surrounding fiberglass. Clean the surface with a cloth and acetone.
Step 7: how to repair a roof
Add catalyst to a small bucket of gel coat that matches your RV gel coat and mix with a mixing stick. Apply the gel coat to the repair with a felt roller. Let the first coat harden then add another thick coat. Allow the gel coat to harden. Apply a thick coat of boat wax to the repair surface and allow it to dry. Buff the repair to shine with a clean cloth.
Warnings. how to fix a roof
- Always wear a respirator when cutting or sanding fiberglass materials.
- Wear rubber gloves when handling catalyzed resin to avoid chemical burns.
Items you will need
- Safety glasses
- Dye grinder
- Fiberglass mat
- Rubber gloves
- Fiberglass resin
- Small bucket
- Stirring rod
- 4 inch felt roller
- Air roller
- 200 grit sandpaper
- Sanding block
- Gel coat
- Boat wax