If you use this rod and our flux you will be able to weld valve seats and then be able to machine them. If you use our TM2000 lens you will be able to actually see the occasional porosity as it tries to form, and you will be able to eliminate it right then- without lengthy cooling, grinding, re-heating and re-welding. Craftsmen do reliable machined repairs on cast iron -first time- with this system. There is no reason you cannot do a perfect job, too.
Kent has searched everywhere for the best flux for welding cast iron and has found the one that gives the finest results. No mixing required. Just heat the rod, dip it in the flux, and weld with the flux-coated rod. 4 oz Jar