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Old 4th Dec 2018, 6:22 pm   #5
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
Default Re: Restoring WW2 Junction Box - confused?

For metal that's deeply pitted but not rusted-through, my approach is to 'pickle' it in something aggressive to make sure all the rust is _really_ removed from the bases of the pits, then first 'mist' over lightly with an acid-etch primer followed by layering-on several coats of high-build primer, sanding down in between each coat, until the pits are filled.

Then leave the item somewhere hot [I use the flue-pipe of my combi-boiler] for a few weeks. Why? Because the primer will still shrink slightly! Then another couple of coats of high-build with more sanding and the job's ready for the topcoat.

Etch-primer and high-build primer are available cheaply in 'rattle-cans' from these guys: https://www.u-pol.com/
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