Originally Posted by
SVT32VDOHC
You want the paper/paint to be constantly lubed. What I do is start by throwing water up the aread to be sanded, then dunk the paper in the water and start moving. The soap that I mentioed adding helps keep it lubed. You don't want it to dry up because then the paint catches the paper and it just screws your motion up or it can give you uneven surfaces.
There are other ways of wet sanding too. They make a Hook-It system that's very pricey. You dry sand it using a DA sander. It's much faster. I wouldn't recommend this if you are a 1 or 2 time per year painter. IF you do it as your job...I highly recommend it since you'll save tons of time and get more jobs in the door.