How To Install GTS Quarter Panels - Wider Is Better

The panel was screwed and clamped back into place. GTS used spatulas to apply Mar-Glass to fill voids and smooth the adhesive. It's left to set up for 24 hours before grinding.

With the Mar-Glass completely dry, the screws were removed. Holloway got busy with a 40-grit disk on a DA sander, removing the excess adhesive and feathering away the hard edge in the channel. If this wasn't done, the line would eventually become visible under the paint.

The screw holes were touched up with a die-grinder. The aim was to feather the holes and leave a slight depression for fiberglass patches. After the holes were dusted and wiped clean, Holloway cut small, circular patches from the fiberglass cloth slightly larger than the size of the feathered area.

Thurmond got busy with the fiberglass on the body seams. He used two long strips of cloth, each enough to cover the seam from the door jamb and over the peak on the decklid. The area along the seam was given a liberal coat of resin; the cloth was applied, then worked in with the paintbrush until it was saturated.

The work continued on the rear fascia, using two layers of shorter pieces of the cloth. Retain as much of the sharp edges on the body's fillets and rounds as possible. Make sure the 'glass cloth is well saturated.

Holloway mixed up and applied a skim coat of Mar-Glass filler/adhesive, making sure to apply enough pressure for the material to fill. After about 30 minutes of curing time, he sanded away most of this with an 80-grit block. He used a wire brush to clean the paper when it loaded up with the still-soft material, then hit it with 80-grit paper, and again with 150-grit on a pad.

This is what it looks like after using the 150-grit sanding block. The panel was ready for primer, more sanding, and preparation for paint in the usual way. GTS recommends applying primer, hitting it with an 80-grit block, priming it again, going over it with a 200-grit block, spraying a guidecoat, then sanding with a 400-grit pad.