Hi. I've been trying everything I can think of to avoid having to re-plaster my pool as the ROI just isn't there for how long I plan to live here. I have about a 20 Y/O in-ground pool with several sections on the walls where the plaster has flaked off. I've removed all loose plaster with a wire brush and am about to start sanding with a diamond pad to try and "feather" the spots so they're smooth to the wall. Doesn't need to be perfect, but it needs to be OK. Is this possible? I've never seen anything about it which leads me to suspect it's a bad idea. Anyone with advice would be very much appreciated!! Thank you.