If your surface is poor and you’ve had pictures
in, and so on, just check it. A bit of fine sandpaper… your prep is the biggest part
of your hands. So I’m not going to rub all the wall surfaces down, but what I’ll do is
run my hand over and I can feel where it needs it and where it doesn’t. Just give it a light
key. Perhaps around here, down the light switch and down that side… So you can see where
I’ve given it a key – the raised areas have gone down flat.