I bought something called a "super scraper" kinda pricy but works great. wood handle carbide tipped. really does a nice job. Use care on alum surfaces, generally speaking its better to drag that to push on alum. I was also advised to not use a "rolox" think that is it, for any kind of alum work, again just FYI for anyone reading this and doing surface prep for gaskets. scraping while not gouging was the key, esp on things like head gaskets.