How to change base of barstools from gold to aged bronze?
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The gold is getting beat up from having a foot rest so need something that holds up to having shoes on it
You can use a Krylon metallic spray paint to get that effect. Their paints are nice and durable.
Rustoleum professional spray makes some great colors and has a high performance line that should hold up to wear and tear on those stools! Best of luck!
You can purchase a metal paint to change from gold to the aged bronze without any problem (rustoleum makes one) ; however, I don't think that there is any product made that won't show wear after time.
There are chemicals you can use to age the shiny gold and give it an aged patina. They don't cover the existing brass, they age it.
You should wire brush it before doing anything, at least to dull the surface so paint will stick to it. I swear by Rustoleum products, and touch-ups on that foot rest would be quick and easy. It should hold up well, just make sure its completely dry before allowing people to use it.
After you paint you want to protect the finish for as long as you can. Use an exterior grade paint that also protects against wear and tear.
Plastic Tubing
The best option, and one that is used all the time, is plastic tubing. This protects almost indefinitely while still allowing the rung to retain its natural beauty. Purchase clear plastic tubing in the right diameter to fit around the rung. Lots of home department stores have a variety of spools that you can choose from. Purchase the tubing in the length needed or clip it to size with diagonal pliers. Use a utility knife to split the tubing lengthwise. Peel it apart and slip it over the rung. The tube will retain its round shape. The edges close tight around the rung. If it's not completely tight on the rung, that's OK. It will provide some movement for your feet, making the foot rest even more comfortable. This works on round wooden rungs or metal equally well.
Finishes and Treatments
Some modern finishes contain formulas that are hard as glass. Polyurethane, even shellac or varnish. Brush the varnish on a few layers at a time, allowing previous layers to dry properly, and completely coat the rung on the top and bottom. Apply at least four coats to protect your rungs. If they look scratched or the finish is looking thin after a few months, apply more finish.