[Smurfenstein]

Just take note of the grit , fine, med, coarse.. if your go coarse you will need to buff when done. make sure you use a spray wax when you do it.

Clay bar kits use a detailer, not wax when actually using the bar. You don't want to use a wax anyhow because you just need something to help lubricate the bar so it doesn't stick, and have cleaning properties. If you use a wax during the actual claying of your car you can end up sealing dirt under the wax before they bar can lift it up.

The most effective method is to do a thorough wash of your car, let it dry completely, clay bar, then follow up with a paste wax.