ok guys. Here's the scoop on the roof sealant, recommended for metal roofs by Camping World.
It's from DYCO and is called C-10 Flow Seal, Self Leveling Sealant. I guess this stuff was designed for the RV industry and metal roofs specifically.
It's formulated with DuPont Hypalon so that it forms a durable, flexible, synthetic rubber seal. temp range is between -30 deg F and 150 deg F.
Recommended Surface prep is a clean dry surface, free of debris, grime, frease or oil and loose caulk.
This is the stuff they used to seal around my solar bracket installation. Let me tell you, it's thick!! It's probably the same stuff that TM used to seal the roof vents and around the Wiengard TV antenna mount too.
I found the above info here;
http://www.pplmotorhomes.com/parts/c...ants/49487.htm
Gregg in Portland