: Any advice on applying LPU? Like I said its going ok but not perfect. Some
: brush strokes are visible and I’m getting better at avoiding runs. Will
: the brush marks fill in with more coats or will I need to sand them out?

I found it flowed best thinned at around 30% in high humidity (50%+) and lower temperatures. Don't use the cross-linker until the final one or two coats. I also applied it with a foam roller. That seemed to work pretty well.

Jim