We’re trying to paint our bathroom in our old, victorian home. It appears previous owners used non-paintable caulk all around the bathroom: on all the trim and moulding, on the tile that is the lower half of the walls, under built in shelves. And they did a pretty poor job, it’s smeared an inch or two onto the walls. We didn’t realize it was non-paintable until we were already painting. I read that you can paint this kinds of caulk with a special base, but would we be better off maybe sanding down the caulk, at least where it’s spread on the wall? Or would using the special base still be OK, and we’d just have to paint back over where we already painted?