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Morning coffee drinking and thinking... for most DIY, shade tree, tool borrowing, fixers of their horseless carriage, a single tube of RTV has been their single, go to, universal application product for a few years. Their only problem was getting enough usable RTV out of the tube. Is this why a high priced special application product has stayed on the part store shelf for a few years ? I don't know about the shelf life of those products. I do consider Advance Auto Parts, Autozone, etc.., similar to grocery stores, even if they don't.
I'll stop there and say, Good luck with it. c\_/