Jointing a dry lined ceiling


I just installed a new plasterboard ceiling (phew - that was a challenge!). I'm now going to do some jointing and have a few questions for those more experienced than I....
1) I'm going to use Gyproc Joint Cement. Is this OK as a finish (i.e. I don't need any additional finish layer on top)?
2) I recently did a little bit of patching up on a wall. At the joints I used joint tape (the paper kind). It seemed okay. A builder friend told me to use self-adhesive scrim tape on the ceiling. Which should I use - paper tape or scrim?
3) When I did the wall, I found it really difficult to get a smooth result over the joints. I sanded by hand as much as I could but the dried-on joint cement always had an edge to it which is still visible. How can I avoid this on the ceiling? Should I spread the joint cement differently? (I'm using the Gyproc guide as a basis). Should I use a power sander to get a better result? what sort of abrasive paper would be best suited??
As always any advice most welcome and appreciated.
Scott.
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Tony wrote:

Just don't use the cement,the skrim webbing is all's that is needed.
--
Sir Benjamin Middlethwaite



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The best board to use if you are not going to skim the whole ceiling is the taper edge stuff. You get a good finish with the scrim and filler. With flat edge board, you have to be really good not to show a hump at the joints.
ken
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