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Cut a piece of glass-fibre mat the same shape as the hole, but 1/4in. (6mm) larger, and lay it behind the hole. Brush liquid resin on to the mat until it is saturated. Lay a second layer of glass-fibre mat behind the first and brush more resin on. Let the resin set hard before final filling.

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Patching rust holes

If a hole in the bodywork is not in a load-bearing area, such as a section of the chassis,...