My firewall had more holes than a politician's promise. Perry (bodyman) used a mig welder on the smaller holes with a piece of aluminium placed against the panel on the inside. Mig Weld does not stick to aluminium. Larger holes were filled with a patch panels. Small holes with a mig welder larger holes with oxy and hammer and doly
Make sure all holes are cleaned with wire wheel or small sander before any welding
regards
andrew
