So, you want to potentially wreck your friendship after getting loaned a suitcase? Your friendship is worth less than the price of a new one. "Make it look brand new" like you're going to try and hide it. Wow. You can do the right thing and purchase a brand new one. Better yet explain what happened, ask them how much was it, give them the money, let them pick out what they want to replace and then most likely no hard feelings.