Kasenit, motor oil, charcoal, or water. I've heard so many ways to harden the surface I'm not sure which one to use. I know Kasenit is meant for this particular job, but its like 10.55+7.50 shipping. If it is only motor oil, then I'll use some I have at the house. What would you guys recommend for the job...so you don't have to go back and do it again? Also, where's a good place to get one of these torches you guys are reffering to?