DONT fiberglass...
ignoring the bun fight of structural integrity
unless you get the prep work perfect and get the resin on before the parent metal has a chance to oxidise then its just going to rust out under the fiberglass then trap more moisture and that will increase the rust rate.
If you have a look at the photos in my disco wrecking thread you can see the end result of a badly applied fiberglass patch, the rust hole in the passangers side rear wheel had been glassed and had turned into a hole a bout 8 inches around.
a similar patch job had been done on the alipine window and when I pulled out the rubber seal the fibreglass stuck to the rubberseal and came out in one large piece along with a bunch of rust. I'm assuming it had at least been a decentish repair job as I didnt pick the fibreglassing untill I had the rubber out but to be fair I wasnt really looking for it as Im wrecking the vehicle, I may have seen it and just written it of as rust I dont care about.
If youd like drop me a PM with the measurements of the bit of rust you need to replace and I'll have at the best section of alpine window I have on that body, a bit of grit blasting welding and polishing will get it in..
I'm tipping that waiting out a clear day and offering a carton to someone who can do a good mig weld will see the replacement section in and more reliable than the fiberglass job.


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