Finish deburring the bottolm skin, and dimple the edges. I thought I might prime all of the inside bottom skin, figuring this is where any moisture will gather if any ever gets in. Also ran the die grinder with a scotchbrite pad attached and took off the sharp edges on all the skins. Primed all the J Channels and inside all the skins along the rivet lines where I cut away the plastic. As I said also primed the botom skin. Once the primer was dry I finished dimpling all the holes, clecoed the whole structure back together and started to rivet.
