Hi Folks; I have several 50 watt halogen bulbs mounted in insulated cans on my HT ceiling. All of the cans have a flanged circle where the round cover goes (that's also the part that holds the little halogen light bulb.) I want to bring drywall right up to the surface of the insulated cans, but I want to have a good acoustic seal, so sound doesn't leak through. I was thinking of running a bead of caulking around the outside of the flanged metal circle to act as a simple seal or gasket between my drywall and can. But things can get pretty hot in that area. Any thoughts on a good heat resistant, fire proof caulking? Does acoustic caulking also resist burning? One of these days I'll have to post pictures of my HT. It's not done, but I can finally say that it's progressing well, and will be useable soon. Thanks, Tom.