Hi hope someone can help wife decided it would be a good idea for me to redecorate the bedroom. I have taken of the wallpaper and am going to emulsion the walls instead of papering. The problem is a lot of the paint that was on prior to wallpapering as come off with the paper I've rubbed down for hours and when starting to paint you can see all where the paint had pulled off. Would it be possible to use a hot air gun take all the old paint off and start fresh. Any advice please.