Is there a tube paint that is opaque that I can paint on old windows that will withstand the weather?
Great question! You can add a glass painting medium to opaque tube paints. However, I don't think it would withstand extreme exposure to the sun or rain or snow. Will the windows we sheltered by an eave or inside a porch? Your best bet would be to test a sample on an old glass surface for a few weeks. And of course, read the manufacturer's directions.
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