Hi D
Cast iron(the rotor)is very porous to begin with but i also divoted each mag location with a center punch ~20 times.The mags were scratched with a hacksaw blade.
I did a test before starting and the mag broke trying to remove it.Sacrificial lamb so to speak.No potting needed.
This is the stuff and works great.
http://www.fieldlines.com/story/2008/7/27/204224/519
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