I have a lady that wishes to repair her Wooden Anderson Sliding Glass Door in which her dog had clawed up the wooden part of her door. She wishes for me to repair,restain it after its finished. My question, is there any product that I can fill these claw marks up and refinish the door with? I have tools to work with and have done finish work before. Is there a filler that hardens so it can be repair, sanded, finished, and stained, that I can purchase?