POR 15 doesn't sand well at all. In fact, its basically impossible to chip it off something once its dry, and I doubt herculiner will adhere to it. Where are you using it?
90K5
See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>