Non-skid polycarbonate crystals can be utilized in one of two ways. They can be added directly to the paint within the can, or broadcast into the freshly applied WR-LPU.
If adding directly to the paint, it's best to experiment some on scrap material. You'll want to first determine how much of the non-skid to add for your liking. Once this is determined, you may want to practice some on your application technique. Apply the non-skid / WR-LPU mixture as the final coat.
The second approach to using non-skid is to broadcast the polycarbonate crystals into freshly applied WR-LPU. Since the WR-LPU set fairly rapidly, the non-skid should be broadcast immediately after application. In some cases, a helper may be necessary. After 4-6 hours (do not go beyond 24 hours) an additional coat of WR-LPU should be applied over the textured surface. This additional coat locks in the non-skid particles for maximum durability.