Light sanding Polyurethane leaves visible scratches
I am applying Minwax fast drying Polyurethane to my wood project and very lightly sanding with 320 grit sandpaper with a sanding block between coats (just finished 3rd coat)and it is causing visible scratches in the finish. I want to get the finish a little smoother but I’m afraid if I apply more pressure I will inflict more scratches in the finish. Is this normal to occur, and should I switch to a 400 or 500 grit sand paper to level out these scratches? I am vacuuming up the dust between coats and only sanding in one direction across the entire length. Thanks in advance.