How to Use Glazing Putty to Fix Fiberglass Auto Parts

  • 2-4 hours
  • Intermediate
  • 20-100
What You'll Need
Glazing putty
Protective gear and working gloves
Coarse and fine sandpaper
Clean sheet of clothe/material

Regular polyester body filler and polyester "putty" are basically the same since they're both Polyester based. Polyester is what fiberglass is made of. The fillers have talc and some other components that give it "body", that is the basic difference between fiberglass resin and polyester body fillers. The Putty has finer ground talc than the regular filler and is, therefore, more expensive. The extra cost is well worth it however for the skim coats and minor repairs.

Glazing Putty is used to fixing fiberglass auto parts because it provides a smooth finish that masks imperfections. It is produced with special chemicals that reduce shrinkage when the material bonds with the surface. This provides a smooth and blemish-free finish. The putty can be used for a wide range of auto repair applications, including scratches, glazes, dents, pits, or imperfections on cars’ surfaces. It also gives a great finish on sheet metals, aluminum, and auto body skin.

Step 1 – Inspection

Start by getting high-quality glazing putty to use on the car. Buy one from a hardware, garage, or mechanic’s store. Get sandpaper as well.

It is important to prepare the fiberglass surface to be fixed or repaired. Clear out a spacious workplace and assemble all items. Make sure the glass material is clean especially at the point where it is to be joined to the car. A clean and wet sheet of cloth can be used to remove dust or dirt.

Step 2 – Prepare the Surface

If there are imperfections on the car’s surface then use sandpaper to prepare the area. It is important to have a clean and smooth area when fixing fiberglass on automobiles. Remove any traces of debris by using a brush. Get sandpaper to get a smooth surface at the point where fiberglass is to be fixed on the car. Scuff on the entire area and remove the fine particles using a brush. Get a dry piece of cloth and wipe away the remaining particles.

Step 3 – Using Glazing Putty

Put thin layers of glazing putty on the fiberglass surface. Make sure it is only applied at the point of contact with the automobile. To avoid messing with the entire fiberglass material, place it on a table and use your hands to squeeze and spread glazing putty at the edges. Be sure to work quickly as well as it is best to fix the auto part when it is still wet.

Step 4 – Fix Auto Parts

Carefully lift the auto part and fix it to the car. If it is one of the windows, open the door and place the auto part at the point of connection. Fix it by holding it down for a few minutes. More glazing putty can be applied to strengthen the point of contact.

Step 5 – Finish Up

Leave the auto part to dry. In case there are any spillages of glazing putty on the car, then use 400-grit or finer sandpaper to scuff away the material. This removes any imperfection and provides a smooth and attractive finish. Get a clean piece of cloth to wipe away any debris or particles.