Nail polish works fine as does Loctite Blue for final install after bedding (I use degreaser or Isopropyl alcohol on the screws to remove grease) ,,,
Bed the bases to receiver with devcon or AcraGel ... personally (when I have done this which is seldom) I wax the receiver (or use a release agent if you have it.. also on the base mounting screws) so that the bedding material doesn't adhere there. Clean the bases ..and let the bedding stick to them. Set the bases up with even torque and wipe off the larger amounts of expressed bedding immediately but dont disturb the release agent .... presumably you are using a single piece base (easier to accommodate uneven receivers) in which case seat (and torque) the "high end" and do not tighten the "low end" of the base to the receiver till the epoxy is dry...pretty obvious. If the screws are "loose" when threaded into the receiver this needs to be fixed before the rest of the process ... and locktite in any colour is not the ideal answer. Either check for proper size screws or retap and go to the next size up .... IMHO