RTV will remain flexible, but it will not reseal itself. The #2 stuff can basically be separated and reused over and over, whereas the RTV will break up into little flexible chunks.
Try it, you'll like it! I promise! The only thing you may not like about this stuff is it never cures. It remains soft and pliable indefinitely. I learned about it years ago as an automotive machinist/rebuilder. We used it on all the tapped holes in an engine block or intake manifold. RTV works great as a gasket, but the #2 stuff is better as a sealer. Say you installed a threaded 90-degree fitting into an intake manifold on the engine stand. When you put the engine in the car, you find the fitting is a few degrees off the correct orientation to line up with the heater hose you wish to connect to it. If you used #2 sealant on the threads of the 90 degree fitting, all you have to do is turn the fitting to the correct orientation. If you used RTV, and allowed it to cure fully, then you will have to remove the fitting, remove the RTV, re-apply the RTV and then re-install the fitting to the correct orientation or risk comprimising the integrity of the cured RTV.
Just stuff I have learned over the years...
Oh... a word of caution: If you get #2 on your shirt, as it doesn't cure, it will become a stain waiting to happen when you throw your shirt in the drier. Clean it off with some laquer thinner prior to laundering the shirt. Ask me how I know this.....
Ron
Ron
