i dont think that it is necessary that total paint be removed from cast iron, unless there is rust, water, peeling, ect. under the paint. as i found out, a good paint job certainly dont need be stripped to bare metal, unless your metal is scratched up, rusty, and knicked alot, it would be best. i had good results with a palmsander, a 4" flap wheel, and good old fashon elbow-grease! but to try and pull all the paint off the textured cast is realy not what i would do other wise.
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