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

[Bill Guyger via R-390]

I bought some Zinc Chromate primer several years ago from an aircraft supply house and the cans indicated on the label that The State of California has determined that this is a carcinogen but then again The State of California has determined that living is hazardous to your health.

I just refinished a couple of 600 Ma. chokes out of a Wilcox Ground to Air (AM about 200 W.) transmitter that dated from the 30's and the end caps were primed with Zinc Chromate under the finish coat so I did Google Z Chromate and it is regarded by other organizations more creditable than The State of California as dangerous if inhaled as an aerosol or in fine particulate form like I was creating by sanding with a flapper wheel so I did put on a mask, but the coating on the chassis of a 390A should not cause a problem since it is more than likely something like Alodine which is another dipped coating similar to Anodizing.

If you are refinishing the front panel you can use self etching primer on the Aluminum. It's available in spray cans at Home Depot and Lowes or in bulk at automotive finish suppliers.  

Bill AD5OL
   


On Monday, October 13, 2014 3:13 PM, Bill Hawkins <bill at iaxs.net> wrote:
  



Zinc Chromate spray paint is still available. Google same.

The primer has been used on aluminum parts for aircraft since WW II, at
least.
True, people have died from cancer since then, but chromate was not
identified as a cause.

This link has some good information, for an Internet source:

http://www.finishing.com/0600-0799/702.shtml

Bill Hawkins

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