[TowerTalk] Anchor bolt rust protection?

[k0myw at att.net]

A recent inquiry regarding base grout prompts me to ask a related question 
that probably reveals mild paranoia on my part...

After grouting between the concrete pad and base plate of my HDX-555, the 
only part of the three anchor bolts left exposed are the very ends above the 
nuts. These exposed ends rust, of course.

Should I consider this rust an evitable patina? Or should I be concerned that 
such rust could lead, over time, to structural weakening of the bolts?

If the latter be the case, what remedies are recommended to protect the bolt 
ends from such rust?

73,
Mike, KØMYW