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From Wikipedia:

One-part silicones (aka "RTV") make use of moisture in the atmosphere to cure from the outside towards the center. The time to cure will decrease with an increase in temperature, humidity and surface area to volume ratio.

When it is possible I use hot water to speed cure my RTV. I often fill my garage sink with hot water and dunk my part(s) in it to speed the curing time. For larger parts I dunk them in my bath tub full of hot water

My '82 Corvette came from the factory with an orange RTV sealing its magnesium valve covers to its heads. They didn't leak but they were awfully difficult to remove because they were bonded to the heads. Caterpillar, Cummins, Detroit Diesel, and John Deere began using RTV on their gaskets as early as the late 60's so RTV has been around for 50 years.
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