Q: Our vacation house has vintage Trex decking. After a few years, it became horribly ugly, and no amount of cleaning or brightening ever did more than just lighten the stains. More than five years ...

Why sand? Sanding and the polishing processes that follow make the car's topcoat as straight and smooth as possible (bye-bye orange peel) and help bring out the paint's gloss. Also, the physical act ...