I use a method I read about in RC Report, by Dick Pettit. You apply a bead of the red high temp silicone gasket material, and then gently tighten the bolts by hand until the silicone starts to squeeze out in a bead. Then tighten very slightly with a ball driver. Then let the silicone dry overnight, then tighten the bolts ( with a lockwasher) down snug. I've tried other ways, but this way has worked the best and the bolts have not come loose.
Sam