As another advises, loctite blue (242) on old bolts is okay. Be sure to torque to specified values.
If you purchase OE rotors, they come with new bolts pretreated with loctite blue 242.
Don't skimp on the loctite. A shop once did on one of my cars, and the bolt backed itself out and fell out while I was driving. Fortunately, it was the lower bolt, so the caliper dragged on the rotor in the direction of rotation rather than against. If it'd been the other way, I shudder to think what may have happened.
(As a side note, keep a variety of sizes and quantities of zip ties in your glove box. I used a zip tie to keep the caliper off the rotor in order to get to a parts place and get the proper size bolt for real replacement.)
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