How can I properly repaint a staircase railing knob?
Maybe 2 or 3 yrs ago I had this inside banister painted. Within two months, the handrail was peeling so I sanded it down, put new primer on it and also sanded and re-primed this knob at the top. Primer was Zinsser BIN Ultimate Stain Blocker. It's gray, as you see here. The banister is still fine except for a few places where one of my cats put his claws on it, but they're very minor and easy to fix. But over time, the knob started losing its shine on top and felt a bit rough. So, knowing I was going to sand it down again and prime and paint it again, and being a person who LOVES to pick at and peel things, this is the result. The primer seems to be in good shape. Question is after I sand the red, I'm sure some of the primer will get sanded so I think I need to apply more primer. I think I put two coats on before, but is that necessary? When I painted it before, I applied 3 coats of red. It's high gloss Sherwin-Williams. I let each coat dry completely and very lightly sanded before applying the following coat. I knew it would be touched more than anything else, so worked carefully (I thought) to make sure it would look nice. It looked great until a few months ago when it started to show some wear. The primer didn't show but the top was rough. Is there something I should do differently? If not, will I have to continue to re-do the knob paint from time to time?
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https://www.hometalk.com/diy/paint/rooms/q-prepping-and-painting-wood-stair-banisters-6415962
Question on prepping/painting my banisters
Paint takes up to 2 weeks to harden and cure. If you could manage not to touch the knob for a full 2 weeks after painting it might last longer.
I would look for a metal "cap", such as black, nickel, brass, etc, and forget it.
Three coats of paint may have been too much. One coat should be enough, two if needed for full coverage. Too thick and it will peel from use. After paint has dried seal with three coats of a water base polyurethane to protect the paint.
Wait overnight before applying the poly. Use a quick dry poly. About an hour between coats.