Let me add that the primer Robinson uses is utter crap. Yes its environmentally friendly for California but in real life down on the gulf coast of the United States their aircraft corrode and fast. We've seen an aircraft with 147 hours on the clock and in for its second annual exhibit corrosion on the trailing edge of the blades, around fasteners, etc. While doing the blade service bulletin that lets you file off the edge We were told by Robinson that we could use epoxy polymide primer instead of the stuff they send in the kit. They by law cannot use certain primers for environmental concerns.