I'm using the mesh type 220 drywall sandpaper to smooth out my primer coats. I posted before about single sided, it works great, clogs less than automotive paper. But I discovered that with the mesh type it's coated on both sides so that when one side wears out you can flip it over. Voila!!!! Twice the sandpaper for one money.
Just when you think everything about sanding had been discovered or done.....the man, Nads comes along ahd throws out new info!! ...thanks for the tip!