![]() ![]() ![]() When shown images of the scratch patterns of different abrasives on painted surfaces it becomes much more clear how they work, and why one is better than another. So, my preference at this point is Granat, because to me, the value is in the mileage and the result. 80 grit abrasive particles average 201 microns while P80 averages 192. But the two systems are NOT exactly the same, so an 80 grit sanding disk is NOT exactly the same as one labeled 'P80'. When you take into consideration that the sanders it is designed to work with are also designed not to heat up the pad, it becomes easy to see why sanders and abrasives that were designed to work together are a very good idea. More recently, most manufacturers have switched to the FEPA system with a 'P' preceding the number. I can tell you so far that having an abrasive that is designed for painted surfaces improves the mileage of the abrasive at least 3 fold across the board, and more in some situations. CAMI Coated Abrasive Manufacturers Institute The United States scale for grading abrasives. FEPA Federal of Euopean Producers of Abrasives The European scale for grading abrasives Also known as P grade due to the grade of grits are preceded by a 'P'. This is accomplished by a stearated coating on the abrasive, which is not waxy and does impact your ability to finish whatsoever. The chart on this page compares both scales, along with relative size in inches and microns. I have been testing the new Granat abrasives by Festool, which are specifically engineered for coated signed not to gum and stick, but rather to release. We all do material removal and in between coat sanding, where the majority of what we do involves putting abrasives on coated surfaces. In other words, not specifically for painted surface work. The problem with most abrasives is that they are made to be general purpose. ![]()
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