I have a castolin eutectic spray welding set up for sale. Its a gravety feed welding unit that is used in conjunction with a oxy aceteline set up. In a nut shell you heat up your part to the correct temp and spray on the material for shaft build up, or surface harding. i used my set up to fix engine blocks. Their are 4 different kinds of surfacing powder in the kit. I mainly used cast iron for my app. Their are others their for shaft buildup and some that are too hard to even machine! Its a really neat set up, instruction in the box, more info available online from castoline, other powders available through them too. I paid 600.00 for it and used it enough fixing engine blocks and rare heads to pay for it.