After the holes were welded I removed as much as possible the remaining rust by sanding the helm. I know that German helmets have a lot number stamped in to it so I was very careful around the area where I expected this number and I found the number 3022:
I could not find the manufacturer code.
The remaining rust was removed with HG Roestoplosser.
contains :
orthophosphoric acid and propaan-2-ol and Isotridecanol, ethoxylated
www.rustbuster.nl
The dark spots are rain drops
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