We have some walls with a gloss or semi-gloss and various issues to sort out before we repaint (probably with a satin). On this first one, if it's like this in various spots, how do you remedy that? Do you just sand away the area - or won't that leave a slight dip in the region? Does it mean you really need to somehow paint-strip the entire wall with some chemical preparation?
And in another room as shown in the two pics below, that's just the wall beneath peeking through and someone had filled wall dents with some sort of filler that didn't apparently work with whatever the wall is made of or the paint or something. What should we do in these areas to prep for paint? (And similar issue as above, regarding chipping.)
