Wet sand with fine emory cloth. Hit your local hardware store up. I'd use 320 grit, as long as you're prepared to re-sand with progressivly finer grits between coats of satin clear. For the final sanding you should be using around a 1200 grit wet emory cloth paper. Mechanically buff with Turtle Wax polishing compound. Use Liquid Glass by hand from then on out.