5", 6" and 8" Discs in 80 - 36 Grits Imperial purple abrasives provide the greatest value per cost, and the highest quality available. These discs utilize high-performance abrasives designed to cut faster and last longer, to obtain maximum usage from each disc. 3M's fastest cutting, longest lasting abrasive for saving labor costs and improving quality All these discs have a stearate coating to prevent loading and provide a consistent finish; resin bonded for heat resistance Excellent for use on tough marine gelcoat, paint and primer systems 740I dark purple discs are very coarse, with a non-loading open coat abrasive pattern on a heavy E-weight paper backing 745I light purple discs come only in 80 grit, they have an evenly distributed closed coat abrasive pattern on a heavy E-weight paper backing Priced by the box
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