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

[Bob Camp]

Hi

The yellowish coating on the aluminum goes by a number of trade names. You can buy a bottle of this or that and spread it on. The problem is that to really get it to stick you need to do a proper strip (as in chemical etch) of the entire piece and then re-coat the entire thing. By far the best way to do that is to take it over to a local plating shop and let them do the job.

Bob

On Oct 11, 2014, at 4:06 PM, Grayson Evans <wa4gvm at gmail.com> wrote:

> 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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