Do you know that sticky stuff that they sell in office supply stores for putting posters on the wall? It comes in white or blue. I find the white is very useful for art purposes, and I’m not putting posters on the wall. First, it makes a wonderful eraser for pencil lines on watercolour paper or canvas. It picks up the pencil without smearing – similar to a kneadable eraser – but cheaper! It also lasts much longer than a kneadable eraser. As well, I use it to hold the wax paper onto my white cardboard that serves as my palette. Less fuss than taping down new wax paper when the palette needs changing. I like it a lot – even have a gob of it in my purse in a small ziplock bag! It goes along with the sketching pencil.