Carbon seatpost setup question
 

Just bought a Ritchey carbon seat post for my bike(Nashbar carbon). Is it necessary to use carbon assembly paste/spray/similar product on the seat post before riding?

When I didn't use paste, my seat post kept slipping down every ride

Where it may not be necessary, it is easier.

Also for those with experience with multiple carbon assembly products, which one works best? Thanks

I have gotten individual packets of it for free from my LBS, and they were labelled Felt and Tacx. I have a tube of Park Tools carbon assembly paste. They all seem to work exactly the same, as far as I can tell. However, I have never done carbon to carbon, only carbon to aluminum.

Tacx works fine. A little goes a long way. I've had the same tube for 4 years or so. If I ever run out, I'd buy whichever one was cheap and avaialable.

Using paste is a really good idea. It significantly reduces the amount of torque necessary to get things to stay put.

This. I have the Ritchey WCS UD seatpost now and did it "right" this time. I used FSA carbon paste. couple bucks from my LBS. There's a thread somewhere (google it) about one particular brand that has rather large 'beads' which indented the guys handlebar surface. avoid that one

Thanks guys, I ordered some Finish Line Fiber Grip and I'll do things right.

I also got a free packet of Tacx from my LBS that I have been using for the last 2 or 3 years that sits in a zip lock bag next to my tools

I concur that you should use it, and just get whatever is cheapest/easiest. Oh, that's what you're doing...carry on!