I have removed wallpaper using DIF that has been on the walls for at least 15 years.After letting the DIF sit on the paper for 15 minutes,the wallpaper removed very easily, but left a coating of glue on the walls that won't even sand off.Any help in how to remove the glue? I am just going to paint over it, first using a primer, base coat and then a feathering technique.Any advise would be greatly appreciated.
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