After a break, I managed to find some motivation to restart the build. I mixed a small amount of the sealer, which turned out to be twice what I needed. I started from the front leading edge rivets and worked my way backward one rivet at a time , trying to place a small amount of sealer in each hole to seal them. However after riveting it still looks like I used half a can on each rivet hole :-)
I was very careful not to let the rivet gun slide on the skin as is it's want, because of the sealer being squeezed out, by continually looking to make sure it hadn't moved.