re: Sealing a cedar fence...What do y'all use?

You don't want to seal Cedar. Cedar has a naturally weatherproofing process. I believe it has something to do with the sap that is inside the wood. The only problem is that it doesn't look great over time because of the discoloring/browning.

I've never made the claim that it should be sealed. I did say that a friend of mine has treated / stained his with old automatic transmission fluid though. He's been doing it for 25 years and it looks as good as new.

What you say about ceder, I believe to be true. Have you ever noticed that grass and weeds hardly exist under the limbs of a ceder tree?

Something about them repels bugs and plant life.