Coatings come in two basic formulations; Solid Film and Dry Film. While the two terms can be and are to a great extent interchangeable, when it comes to bearings, the differences are important. A Solid Film lubricant derives it's name from the resin film formed during curing. This film has greater internal bond strength than the bond to the substrate, in this case the bearing. A Dry Film, on the other hand, has a weaker internal bond than the bond to the substrate. When these features are applied to a bearing, the Dry Film is superior. Since no coating is a 100% friction-free material, some pressure will be exerted against the coatings. In a rotational application, such as we are discussing, the coating needs to be able to MINIMALLY flake away when such pressure is reached. Otherwise, the coating can delaminate. DFL-functions in this manner. Generally the particle size that can be removed is under 1 micron.