... 4.Velcro backer 5.Grit: #6, #16, #40, #80, #150 Concrete floor grinder1. Applications: To remove all types of stubborn coatings ... , such as paint varnish, glue, epoxy, acrylic screed residue, VCT mastic, black tar adhesive as well as thick ... coatings. 3. Grit: #6, #16, #40, #80, #1504. Velcro backer Concrete floor grinder