Didn't really get a whole lot done tonight, but nonetheless it feels significant after so many weeks working on fuel tubing (which I still haven't finished: right side return line to do). Tonight I cleco'd on the side skins, with firewall sealant on the forward edge between the firewall and the skin. I also put in the two MSP-42 blind rivets at the bottom of the wing spar opening on each side. Part of what took some time tonight was cleaning the sealant from the outside of the skin; its still a mess on the inside of the firewall flange and I'll see what I can do about that, if anything, after it has set. I'm not too bothered about it though. I was planning to start rivetting tonight, but in the end I've decided to leave it for the sealant to set properly.