I gave up on trying to prime the rear spar as it has rained seemingly forever. It's supposed to stop on Thursday and then be nice this weekend but I have family obligations (trickle out the goodwill). I'm not sure when I will get to prime so I went ahead and clecoed the ribs to the spars and drilled the holes to final size. I deburred the outside of the spars but need to disassemble the structures and debur the inside of the spars and the ribs. I will prime the ribs and rear spars at the same time.