I have done some playing with paints. None I have found come close to
the factory toughness. Black nail polish makes a surprisingly good
touch-up for glossy paint. Xynolite Rust-Mate Epoxy is the best spray
paint I've found Pretty tough when baked. All of the paints I've used
improve quite a bit when baked. Of course, we have to prepare the
surfaces perfectly, and use a primer if it is called for.
Gene
Robert Mueller wrote:
>
> There is another way to blacken brass besides painting it. The folks who
> do Tiffany glass work use a chemical treatment to blacken their copper. It
> will normally work on brass as well. There are different recipes for this
> stuff and some are better than others so I suggest a trial before using it
> on the real camera. Some versions make a gray rather than blacker finish.
> If you search for recipes intended for optical parts, which should be very
> black, you could do even better, though you may be making the stuff
> yourself (No doubt there are sources for the finished product if you can
> find one.) It is my feeling that these treatments are less prone to chip
> than paints, especially under concentrated loads as might occur on camera
> rails.
>
> One other possibility is two-component paints. Some seem to be based on an
> epoxy formula. These can be more rugged than normal paints, though baked
> finishes might be the best, if you get the right one.
>
> If you do try the blackening of the brass itself instead of painting it,
> you can still protect the result with a clear finish.
>
> Who knows, the same methods may be just right for the interior metal parts
> or even the exterior parts!
>
> Does anybody know how good quality commercial products, like cameras, are
> coated? These paints can be quite robust. Are we able to buy them (I
> tried once and was told I had to buy massive quantities compared to what I
> can use before it goes bad, if I wanted two-component finishes in
> industrial quality.)
>
> Bob
>
> Dr. Robert Mueller
> Institut für Festkörperforschung, FZ-Juelich
> D-52425 Juelich, Germany
> phone: + 49 2461 61 4550 FAX: + 49 2461 61 2610
> email: [EMAIL PROTECTED]
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