A guy I work with told me his daughter drew a US map on her bedroom wall in crayon. Though she may get an A in geography for her effort,dad is bummed. He said the big box stores told him they don't sell any paint or primer to cover crayon,that he would have to sand it smooth first. Problem is they are heavily textured walls,so he's afraid of trying to match the texture after the sanding.
Will any paint or primer cover crayon? I've never had to deal with this (my kids use paper).