I am getting ready to do some work on my motor tomorrow and have a question. What is a good pad to take off the head gasket material on the deck of the block. I have a air compressor and compressor tools but would like a pad that is safe for the aluminum (where to find it, and such) I know not to hold it in one area and to plug everything so I'm not that mechanicly (spell?) horrible. Just want something safe to use on aluminum.