To answer your question, its usually recommended that you wait a minimum of 6 months before sealing your deck. This allows the pressure treated lumber to dry out. If you don't wait, the sealing won't take. Since its the end of July, you might as well wait until next spring. Then, you'll probably have to pressure wash it before you seal it but the deck will withstand the Western PA weather until then.
As for Craig's questions, you may answer them if you wish, but the answer will still be the same.