[R-390] What is on the 390 chassis anyway

[Grayson Evans]

I am in the process of restoring one of my R390A’s,  I disassembled it and disassembled the chassis.  I am trying to clean it up, and get the chassis back in reasonable shape.  In the process I have to do some scrubbing to get the dirt, old adhesive labels, and corrosion off the chassis pieces (sides, back, partitions, etc.), 
The chassis metal is coated with a light yellow something.  Is this an anodized coating or something the manufacturer sprays on?  It comes off quite easy, so I don’t think it is an anodized coating.   Is it the same stuff thats on the solder connections?  

What would you recommend as the best (or reasonable) way to treat the metal in areas where the coating is removed?  just covering with a light machine oil?  Spray it with a clear acrylic?  


Grayson
TA2ZGE - Ankara, Turkey
KJ7UM
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