Probably the easiest thing is to have them shot with basecoat/clearcoat
automotive finishes by a local collision repair body shop. Often you can
"piggyback" them on to another job for a few dollars if they aren't too
busy. These materials are quite expensive but if they are already set up
and have a gun cup mixed it's pure extra revenue for them.
Anodizing on aluminum is very popular and cool looking if your surface
prep is good and your panel or chassis is all aluminum.
Gun bluing is another option on steel panels. See the gunsmithing
literaturee for details. It can be overshot with lacquer to avoid the need
for oiling.
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