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Discussion Starter #1
i installed a new thermostat on the 350sbc. how long before i can drive the car? there are no instructions that say wait before driving. the sealent says 24 hrs for full cure. i put a new gasket and waited about 4 hours other day and it leaked. so im doing it again. is there a fast sealer? do auto shops wait 12-24 hrs before starting the car?
 

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Discussion Starter #3
normal paper gasket. i usually use blue but i dont have any on hand and used clear sealent. says it will work on packing. but ive never used it before on thermostat gasket. i usually never use a paper gasket at all just sealent
 

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I normally vary the time depening on the amount of RTV I use. If I am plugging something or for something like and intake gasket I normally wait overnight. Like lluciano said, a thin amount shouldn't take too long.

I'd wait as long as you can stand to lol. Thermostats are fairly easy to get to. If its something hard or large I like to play it safe.
 

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It sounds like you may have a warped thermostat housing. If it leaks again check to see if the gasket surface is flat. Most of those chrome thermostat housing warp easily. The stock ones are much better.
 

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You must have another problem causing the leakage besides the RTV not curing enough. I never allow any time to cure, but rather fire'em right up and on to the next one. I do this six days a week all day long. HTH
 

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Discussion Starter #7
i let it sit for 2 hours and just drove it. leaks gone. i never used clear rtv. seems to take less of the blue to seal as good. youre right bstmech i remember driving off after i replaced the thermostat before.
 

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Clear rtv? Isn't that for bathtubs? If your housing isn't warped (lap it on a sheet of fine grit body shop sand paper) and you use a good quality gasket, it should seal without a bunch of goop. I do like to use a thin coat of ultra blue because it makes getting the gsket off easier for the next guy.
 
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