Valve cover torque specs

I always start in the middle of the valve cover and work myself out to each end using a torque wrench. I do this three times until reaching final torque spec. Once the engine has gone through some heat cycles torque them once more to spec. They will need to be tightened. I have never seen it where they haven't needed tightened up some. I tried something a little different last time. Once my engine went through some heat cycles I removed the bolts one at a time and put some thread locker on them then torqued them to spec. For some reason the ARP valve cover bolts I was using kept backing off but after I added thread locker they have stayed torqued.