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FYI - the grey Permatex Gear Oil RTV really does take a long time to dry. It says 24 hours to dry, unless the temperature is cold - then longer. I put a dab of the stuff on some cardboard, and after 24 hours there was a good skin on it but it was still liquid inside. After 48 hours it was completely dry.
I filled it with oil today (1 quart, 24 ounces), and it was just a little above the edge of the fill hole. I drove it around and checked for leaks and it looks good so far.