these are the epoxy ones Phil.....but epoxy coated in this case might,nt be all that it sounds
the coating is more like a fine spray job over some kind of copper coloured plating ...strange things
the damaged ones were on the front rotor ( stator rubbed , clumsy air gap)
last year on the back rotor i did find one showing signs of corrosion ...
it got a clean up and sealing with some 2 tube cheap epoxy...( erm...it,s thinner than it looks ..
) ..the dimmple look on the mags is a coating of epoxy rubbed over their surface,s ...(for luck )
this one did,nt rub the stator ...just got tired ..
.., bad handling might be more the culprit here though
the air gap is set on the mill with 4 nyloc nuts , which means using the 24 mm spanner to set the gap before the front rotor is jacked on ......the rear rotor grabbed the spanner " a lot " ...a couple of mags (maybe this one)...took a bit of unnecessary brusing at first ..the blistered bit here was at the bottom of the mag , closest to the mounting studs
the mills at roughly it,s 5,th year.....in our climate any mischievous mags might make their entrance around now .....
when its reassmbled i,ll try for the biggest airgap i can safely go for..