I've been preaching the virtues of ScotchKote for years. It is the easiest to appy, 1 drop to one half of the rings, and works better than anything I've tried, tape, rosin, lapping...you name it. From .309 JDJ to .50 Alaskan handguns, and from .22 LR to .458 and .416 Rigby, this stuff won't let your scope slip. To remove scope, just pull up on the scope and clean up with acetone.