I do it the same way.
But, to clarify, you do not want the RTV to fully dry.
You want to RTV to get "tacky" to the touch. That time varies depending on temperature, humidity, sunlight, the position of Jupiter in relationship to Mars , etc.
Fwiw, imho, trying to do the thermostat housing another way than the above, is a great way to learn a lot of new swear words.
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