If you aren't going for a high-polish then you may get away with dry sanding. Wet sanding may be preferable but that creates a whole new set of hassles.
Does anything go down after the sealer?
There is more than one way to do it but I always use a sealer and finish combination, two different products. The sealer should last forever and the finish is considered a sacrificial coating and can be renewed from time to time. The products I use are for commercial installations. I can send you the product names to see if they are available in your neck of the woods.