Magnet bonding for applications just like this have a whole section in the Loctite catalog.
PM me with your number so we can talk this through.
Originally Posted by Wirespokes
Dirty - this is a Valeo Starter motor. It's a permanent magnet motor and they're glued to the inner part of the housing. The first 20 years these starters were used on BMW twins the glue would sometimes give way and allow the magnets to come loose and stick to the armature, locking up the motor.
Do you still feel this is the best product for the application?