The problem is when you lubricate, be it soapy water, naptha, or mineral spirits, you effectively slow down the polishing process because you've made the surface slick. The same action that lubricates the paper and prevents it from clogging, interferes with the ability for that paper to cut. The advantages of the dry sanding are that you don't have to worry about the finish lifting, getting messy water inside your nice clean body. If you sand through, none of your lubricant will contaminate your surfaces. I have noticed that wet sanding with mineral spirits is more aggressive than soapy water.
Mineral spirits have none.
Another advantage of dry sanding is that you have a better idea of the progress you're making. I always think my wet surfaces look great, then I realize I was fooling myself once they dry. I think there is more to the aggressiveness of mineral spirits than the lack of surfactant content. I have noticed that you can leave a burn in the lacquer if you get a big drip that you don t wipe off. Hi,I have two more questions.