I sanded the primer off down to the epoxy with 400 grit wet sandpaper (would not recommend, too labor intensive). I didn't weigh before and after, but I belive the matte clearcoat I sprayed after is a little lighter but not worth it unless you just want to see the weave. I used the Shimano chain guide SM-CD800 ISG05.
Two rides in, this thing rides like a Cadillac compared to the M2 Stumpjumper circa 1997 I've been riding. BTW the grip and pace is unreal.