I started the fiberglass repairs yesterday. Where I could I simply sanded off all of the old body filler so I could get to the base of whatever repairs had been made. I found that only about half of the old repairs had been done correctly, most were just bondo'ed over. The area over the back wheel had a crack that went all the way through the panel. I ground the area around the crack down far enough to allow me to lay in several pieces of fiberglass.
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I also had to remove several broken chunks of glass and plastic at the front corner. I was able to insert fiberglass behing the damaged area as well as on the surface, hopefully it will provide a strong and lasting repair.
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This area was cracked through and had no support. If you applied pressure to the top of the panel the crack would open up. I again sanded it all down to the bare fiberglass, then I put two layers of fiberglass behind the damaged panel to strengthen the area. After that I simply layered the glass on top. You can also see where I have filled the holes from the spoiler mounts. Today I will sand down the glass repairs and start with the body filler.
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I am looking for advice on block sanding. I have a 20 gal. air compressor that I can use for air tools. What kind of block sanders do you all recommend?