How to Use a Fiberglass Cloth & Resin Car Repair Kit

Instructions

• 1

  With coarse-grit sandpaper, sand the area which needs to be repaired. This will ensure that the fiberglass bonds properly to the damaged surface. Sand the area until it is properly smooth.
• 2

  Now you need to get rid of grease and dirt from the damaged surface. In order to accomplish this, wipe clean the damaged surface with acetone applied to a clean rag. If there is any dust or grease accumulated on the surface, fiberglass will not bond to the surface and will eventually delaminate.
• 3

  Cut the fiberglass mat in appropriate size with a sharp razor knife. Cut each fiberglass layer smaller than its predecessor. Cut as many layers as necessary.
• 4

  In a mixing bucket, prepare a mixture of fiberglass resin and hardener. To make the mixture uniform, stir it thoroughly with a stir stick. Refer to the instructions listed on the container for detailed instructions on how you need to prepare the resin-hardener mixture.
• 5

  Apply a small quantity of fibreglass resin on a felt roller and use this roller to wet the damaged surface. Place the smallest layer of fibreglass mat on the area that you are repairing and then apply resin-hardener mixture with the help of the felt roller. Keep applying the resin-hardener mixture until no dry spots remain. Air bubbles may have accumulated on the repair. Roll them out with an air roller.
• 6

  Repeat the earlier step to apply all pre-cut layers of fiberglass mat. Wait until the fiberglass hardens and cools off completely before proceeding to the next step.
• 7

  Use fine-grit sandpaper and palm sander to sand the fiberglass. Continue to sand until the repaired surface is level with rest of the surface.