I have used oil paint on gold frames to change the color (not on real gilding though, just the faux gold stuff that JFM uses). I wanted to make a frame look a bit more red to match the painting a bit better. I would say the results were so-so. It did dull the finish of the frame considerably and I wouldn't recommend it.
The frame I did this on was a flat, contemporary style. It might work better on an ornate style of molding, so the oil paint would settle into the carved areas and leave the high parts clean and still show the original gold color. None of this would help you make a bright gold warmer though.
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