Get matched with top fence painters in Willits, CA

You shouldn't paint a metal fence. Painting doesn't necessarily damage a corrugated metal fence, but these types of fences are meant to flex, and paint can easily chip and break off. Latex paints can address this issue, but those tend not to be very weather-resistant. Certain paints can trap moisture in the corrugation, which can rust the metal and lead to corrosion. And finally, if you paint a copper fence, it won't patina, which is one of the main reasons people buy copper.  

Yes, you can limewash surfaces other than brick. Plaster, stone, stucco, and concrete can all also be limewashed. Any porous surface that will absorb the wash is a good candidate for limewash, although it won’t help much with waterproofing. If you choose to limewash over paint, you’ll need to prep before applying it to avoid a powdery, chalky finish. Shiny surfaces like metal or glass can’t absorb limewash, so it’s not suited for these.

To prevent a fence from becoming dirty, hose it down weekly and after every time you mow the lawn. This will prevent algae from being able to feed on grass clippings. You should also wash your fence once per season and trim plants so they don’t touch it. As a precautionary measure, you can treat your fence with a coating of a mold prevention product.

You can apply stain over peeling stain, but it’s not a good idea. Your old stain will get in the way of your new stain bonding to the wood, so you’re likely going to see the same issue again shortly after application. Your best option is to sand off the old stain and clean the surface thoroughly before applying new stain.