Delayed response…. I haven’t bought any yet but I have something similar and am madly doctoring my Flothius/Tombee d’Orphee with it as so many pedal corrections prevented me from ever finishing the piece, too many for whitener/tippex… the clarity is a godsend, already making a difference My brother is an architect so always thought I’d seen masking tape on his drawing board… anyway he says he buys various supplies of it.