I’m curious about everyone's maintenance schedules. We use a standard bead mill for making thick coatings, using 1.5mm ceramic beads. Lately, I've noticed our processing time has increased just to get the same particle size. I suspect the beads are wearing down and losing their shape, but it's only been six months since we last swapped them out. How often do you usually need to replace the grinding media in your setup? Does liquid viscosity play a big part in wear?