D.D.
A friend of mine stencils her set all the time. She doesn't sand just lightly stencils whatever pattern she wants and changes out the knobs. When she gets tired of it she used a Mr Clean eraser and it comes right off (sometime it does come off a little when she cleans). Then she just puts on a new pattern and new knobs. She rotates between a couple sets of knobs she has used over the years.