I got an old house and needed to rip wallpaper and skim coat old lath and plaster walls I was using a smaller skimming tool and it was taking forever. I knew it was leaving the walls wavy not filling in low spots but it didn't bother me as long as they were smooth.Then I got this to make things go faster. But with how wide it is it REALLY shows me the low spots, and now it bothers me with how low they actually are. So I'll be spending more om materials to fill them hahaha.This is why I shouldn't buy nice things I was fine with the walls being imperfect untill I used this today.