Doing a fiberglass repair on a major rusted out area is dodgy at best. The different coefficents of expansion under hot and cold conditions will eventually cause delamination around all the seams of the patch. The only proper way of repairing panels is welding in new sheet metal. Anything less will always be referred to as a bondo repair severely limiting resale value.

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Bill Reimels
Now down to one:
1972 300SE 3.5 W109 (Euro delivery)