... putty, fine grit product is suitable for sanding paint surface. L338 Backing: Film Raw Material Size: 1.38m*100m ... wood, metal, filler, putty, electronic, autobody, paint etc.This material is mainly made into: Velcro sand paper and self-adhesive sanding ... the sandpaper.The third point is, it is of film backing, so the abrasive surface evenness is much better than conventional paper .Therefore, ...