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I bought an old stancor potted power transformer off the bay.
It is in very good shape but naturaly the paint is scratched and scuffed in places. I have sanded it down to bare metal and want
repaint it. Does anyone know of a good paint for this?
I suppose any high temp automotive paint would do, but I was
wondering if anyone has a favorite paint for this?
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I've refinished transformers with a number of different types of paint. Almost always with the cheapie aerosol can type paints and sometimes a brush.The important thing is not the paint. It's to make sure you have a smooth and clean surface before applying anything to the trannies. After sanding to a smooth finish, I clean the surface with alcohol or acetone and then apply a coat or two of primer and then the paint.
If you're looking for a highly reflective finish, enamel applied with a high quality brush is generally better. If you want to go overboard buy one of the hobbyist spray gun's and compressor, you'll get a beautiful finish but will have to spend about $200.
I generally use a metallic matt finish on trannys in which case the aerosol cans are more than adequate and the price is hard to beat.
You don't need high temp automotive paint, just a good automotive acrylic enamel will take the heat just fine. Think how hot a car's finish gets in the sun (especially dark colors) - much hotter than a trafo! The automotive paints also expand and contract well as the tranny heats/cools, they're much more flexible than "hobby" paints.I like acrylic enamels because they are easy to apply and require no buffing. Just remember that enamels dry two ways:
1. By evaporation of solvents, and
2. By absorption of oxygen from the air.
So while the enamel is air "dry" in an hour or two, it isn't hard enough to withstand handling for about 30 days unless you force dry it.
Auto spray touch up paints are a good product - do be sure to use the correct primer under the color coat for maximum durability. You can shoot clear over the top if you want too.
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