That's the lamest excuse ever not to use RTV. I've told this story before but here it is again. Back in the late 80s-early 90s I worked for our local Chevy dealer in the service department. They used exactly the same liquid product you posted......but of course it was GM's own brand. Same liquid teflon. GM sent out a TSB (technical service bulletin) instructing everyone to stop using it, because it was boiling off of head bolts and coolant was migrating up the bolts into the valve cover area and contaminating the engine oil with coolant. It was, too. We saw many examples, especially the GM 2.8 and 3.1 V6s. They were really bad about it for some reason. That's why I use RTV to this day and I've never had a failure. Clean up? Seriously? You cannot be that lazy.
