I think I read somewhere that if you're using a dull rotary cutter that they will scar the cutting board. I can tell, when I see tuffs of batting or fabric stuck on the cutting board, it's time to change blades. I usually just clean the cutting board up with some netting and all is well again. I've never known a board to be 'hurt' so bad that it doesn't repair itself. I'd certainly write the manufacturer and ask for their help!