Yes I use loctite on all my metal-to-metal screws and use either purple or blue. Purple is not as strong as blue and is made for small fasteners. I do not do RTR but if you do RTR need to be checked out like all have said above. If all you are doing is bashing I would stick with 20% nitro but yes you can go to 30% if you have the right glow plug and the head is shimmed properly you all so need to retune.