I have a "Lil' Dipper' Crock pot (for hot dips and what have you) that I got at a grage sale, it's not the nicest looking, pretty beat up with scratches and what not, SO I was planning on painting it with chalkboard paint, that way I can write & rewrite what kind of dip is is it. Now, My question, Is chalkboard paint heat resistant/safe? The out side of them get pretty warm..Thanks!