[R-390] front panel corrosion

[Bob Camp]

Hi

One thing that is a little expensive but it may help the process. A lot 
of hobby shops sell little air brush gizmos that will also do sand 
blasting. Obviously the chunks of sand they blow are pretty small. They 
should be just about perfect for cleaning out pits in a damaged front 
panel.

There are also chemical prep agents that might help with the cleaning 
process.

A final really weird approach would be do do a little reverse anodizing 
in the area. It should take out the rough stuff around the corrosion.

What ever you do it's a good idea to do a water wash and oven dry 
before you do the filling.

It can be a real pain to do all the filling, sanding, and painting only 
to see the stuff all pop out three months later.

	Take Care!

		Bob Camp
		KB8TQ



On Jul 4, 2004, at 7:37 PM, Barry Hauser wrote:

> Hi Brian
>
> What you need to do exactly depends on how deep the corrosion has cut 
> into
> them.  In any event, it's under the paint, so the panels need to be 
> stripped
> first with paint stripper and cleaned up with an abrasive pad, like
> Scotchbrite.  If the pitting is deep, you'll have to excavate with a 
> sharp
> tool or at least a wire brush in those spots and fill the pits with
> something like auto body putty or "liquid aluminum" or some epoxy based
> stuff.  Then sand down the whole thing smooth.  Apply alum-prep or used
> self-etching primer and your choice of finish coats - e.g. Rustoleum 
> Smoke
> Grey.
>
> If the pitting is close to the stampings, that will be difficult to fix
> completely.
>
> Some of  that corrosion may just be under the paint and not too deep, 
> but
> I've seen it go nearly all the way through the panel on some.  (Started
> scraping and experienced the "China Syndrome")   If they're that bad, 
> you
> are better off getting used panels that are in better shape and 
> refinishing
> those, if needed.
>
> Attempting to neutralize and seal over the corrosion is not likely to 
> work.
> If it's minor, and you're not up to doing the full refinishing 
> routine, you
> might just try some WD-40 on a rag.  I've done that -- seems to help, 
> but
> I'm not sure how effective it is long term.
>
> Barry
>
>
>
> ----- Original Message -----
> From: <doorbar61 at tiscali.co.uk>
> To: <r-390 at mailman.qth.net>
> Sent: Sunday, July 04, 2004 6:36 PM
> Subject: [R-390] front panel corrosion
>
>
> have 390a and sp600 and i want to repaint the front panels, problem is 
> they
> are both corroding, can anything be done to halt the corroding, like 
> washing
> them in a particuler fluid or sealing the surface or anything else. 
> many
> thanks brian
>
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