This 100-grit sanding sponge is perfect for surfaces with large imperfections or hard and resistant materials. The flexibility of the material easily conforms to any shape including rounded surfaces and hard-to-reach recesses. This product can be used on a full range of materials including resin, metal, wood, and of course plastic. It’s also highly useful for removing traces of glue or putty when filling gaps. It can be used both dry and moistened with water.