You only need enough paste to coat the splines- any more just slings off onto the rear wheel anyway. I usually use a Q-tip (cotton swab in the rest of the world) and work a tad (technical term) into the grooves of the female spline. Also the only place any paste is needed is on the side faces of each spline- that is the only area there is any contact with the other (male) splines. Packing the bottom of the splines with paste does no good and eventually it will still sling out onto the rear wheel.
I have never seen a set of front wheel bearings in a motorcycle fail unless the wheel seals failed first. I have replaced the seals on my '08 twice now and each time they were worn sufficiently that they did not touch the wheel spacers and so obviously could not seal water and debris out of the hub. Once the seals fail and water gets in, the bearings start to corrode and after a while they get loose enough to make noise or move roughly. That is the time someone will notice a failed bearing but again, it was really a seal failure. Sort of the same way falling off a building's roof is really the cause of the pain- hitting the ground is only the inevitable result and causes the physical harm but the fall is the root of the problem.
Any high temperature grease if fine to lube the front seals. You really cannot lube the bearings as they are sealed but lubing the seals will help the seals themselves last longer. I typically use wheel bearing grease because it is a high temperature grease and it is quite thick and doesn't sling onto the outer wheel or brakes much. Thinner grease will tend to migrate onto the outer wheel and brake rotor.
Brian
Ive read that moly 60 is good for the rear splines when I swap my tires out but how much. Lay it on thick or just a thin layer. I'm swapping a new set of tires on next week and just trying to be ready. Also I have mobil1 synthetic grease would this be fine to pack the front bearings with,? thanks