Hello, well this type of sandpaper does not cause damage to the metal of the pot, even those pots that have been scratched with brittle shine, these scratches can be erased with this 400 sandpaper, now in this case I only tried to remove the crystallized carbon from the pot, the other traces of fat can be removed simply with a sponge and degreasing liquid and that's it, but burnt from a pot cannot be removed with a sponge and if done with a wire mop we would scratch the pot, I invite you to put in Practice this idea, greetings and thank you for your pleasant comment.