[GreenKeys] Re: More on Painting

[Steve Schlink]

Just FYI, the flatting additive is very finely ground silica sand.

For toughness, Sherwin-Williams makes a catalyzed (two part) polyurethane 
called Polane that is about as tough as you can get. That is what Western 
Electric used to paint plastic telephone handsets and cases with.

Crinkling involves a solvent mix that allows the paint to form a film, then 
another solvent to soften it, much like paint remover does. I'm not sure 
what the second solvent is, although that should be easy to determine. I 
suspect that you could add the correct proportions and get the desire 
effect using a conventional spray gun, although i have never had the need 
to pursue it.

Regarding spray painting, If you were getting globs, then the paint wasn't 
being atomized.  This is caused by the paint being too thick for the needle 
& air cap combination or not enough atomization pressure.

There are two types of spray guns now:

1. The older type guns with the cup on the bottom;

         These are either suction or pressure feed. Most inexpensive guns 
are suction, which requires that the paint be thinned (reduced) 
substantially. Pressure feed guns are capable of 'spraying' glue, so 
viscosity isn't an issue.

2. The newer guns are HVLP (high volume low pressure) types that were 
developed to reduce pollution. The are the ones with the material cup on 
the top, and feed via gravity.

Steve

At 10:31 PM 6/28/02 -0500, jhaynes@alumni.uark.edu wrote:
>When you say "original Teletype black" you probably mean black wrinkle.
>There was an earlier glossy black finish from the Model 12 days when
>typewriters and adding machines and other office equipment was painted
>glossy black.
>
>I've heard you can get black wrinkle in spray cans at Harley-Davidson
>shops, but the price is awfully high.  Maybe some automotive places have
>it.  If the original paint is not peeling and is not too scuffed up you
>can just spray with semi-gloss black paint as someone has suggested.
>
>For the gray-green, I've found Rust Oleum spruce green at Wal-Mart.  But
>it looks too green to me.  I took a clean sample of gray-green painted
>metal to a local paint shop and they computer matched it in a semi-gloss
>oil enamel.  They suggested I put it on with a sponge roller, which I did
>and to me it looks fine.  That is painting over an existing wrinkle finish
>that is dirty and faded and a bit scuffed.
>
>Many years ago I went to a Sherwin-Williams dealer in industrial paints
>and they had a color sample book and I picked one by eye that looked
>pretty close to what I thought a Teletype finish should be.  I have the
>formula somewhere but can't find it right now.  It was a gallon of
>Kem-Lustrall green with some gray added and also some "multi-purpose
>flatting base"  This flatting base is what you put in to adjust the
>glossiness.
>
>This paint was supposed to be smooth and sprayed on.  I never tried
>applying with a brush or roller.  I got the cheapest spray paint outfit
>that Sears had, which uses a diaphragm compressor.  Spraying with this the
>paint came out in globs and made a nice texture without even trying.
>However it is far less durable than the real textured vinyls that replaced
>the wrinkle finishes at Teletype.
>
>I suppose if I went to a Sherwin-Williams dealer today they wouldn't
>bother with the color samples and would just computer match to a sample
>I would bring in.
>
>
>
>_______________________________________________
>GreenKeys mailing list
>GreenKeys@mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/greenkeys