I foolishly stripped out the plug thread on my PTE36 when I loosened and tightened the plug while the engine was hot. Doh! Lesson learned. I went ahead and paid the astronomical price for the M10 X 1.0 heli coil kit since I have some Super Tiger engines that I am going to convert to gas and I want to use a CM-6 plug instead of the tiny 1/4 - 32 plugs. My question is, should I use some sort of sealant like red silicone when I screw in the heli-coil or will it do a good enough job on it's own?