How to Use Fiberglass Resin on an Auto

Fiberglass resin is often used on soap box cars and similar autos, giving it an airtight seal to protect water and other contaminants from entering the frame. You can use the same fiberglass materials on fully motorized cars, mainly to patch up excessively rusted spots and holes in the body. Fiberglass matting and resin can help create a patch if it you are not able to patch it with sheet metal or replace the fender altogether.

Instructions

1

Clear away all rust from the area on the car, using oil, sandpaper or a power sander. If the rust is too great to remove, cut the metal off the car using metal shears.

2

Mix the fiberglass resin according to the instructions provided for your particular resin. Work in an open, ventilated area, wear breathing protection if needed, and remember that the resin will harden relatively quickly.

3

Lay the fiberglass matting onto the surface of the car. If you are covering a small portion of the car, cut the fiberglass until it is just enough to cover the needed area.

4

Apply the resin to the fiberglass with a brush, making sure you coat the surface evenly.

5

Add another layer of fiberglass and resin to the surface while the first coat is still wet if needed. If you are covering an entire car or single part, you may need at least three layers of fiberglass and resin.

6

Coat the hardened resin with Bondo or a similar filler/hardening agent and wait for this substance to dry and harden; it will probably take overnight.

7

Spray a single coat of primer over the surface and wait for it to dry according to the instructions, then apply two coats of paint in even strokes, waiting 90 minutes between coats. Cover the paint with three coats of clear coat, waiting 15 minutes between these coats.