I use a product called Penofin (50 CAD per gallon), available from Timbertown. The trick with cedar is to use an oil stain. But you have to finish both sides, or the greying can occur from the backside out. I know information you could have used yesterday.
Penofin is a rosewood oil that will pentrate the surface and leave a nice wet look (I use transparent to get that rich burnt umber look). It only requires one coat - leave for 20 mins then wipe off excess. The Sikkens product (Setol) requires three coats.
Thompsons water seal will make sure that you cedar will be waterproof but will not prevent greying as it doesn't have a UV shield. Cedar does not rot very quickly see 20-30 years.
Go forth and make your decision.
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