Yes, you can use blue loc-tite on them (Blue 242). Do not use red or green! All the bolts should have a blue loc-tite patch on them from the factory, but if they were ever taken completely out, the loc-tite falls off.
Just as an FYI, you can safely use blue loc-tite on all your pivot bolts.
Just as an FYI, you can safely use blue loc-tite on all your pivot bolts.