Today a begun prosealing the ribs, I opted to do this in two steps. I prosealed the rib, then put a cleco in every hole (I even added a small nut between the cleco and the skin, it gives a bit of a better grip). I will let the proseal cure overnight and then rivet everything tomorrow.



Here is an inside view, tomorrow after the riveting I'll have to thoroughly check the flliet's integrity.

This morning I riveted the right tank stiffeners. Being a bit more careful and organized, allowed for a much cleaner work. I finished by reassembling both fuel tanks, this will allow to begin working on the ribs next time.

Today I used ProSeal for the first time. This two part compound needs to be mixed in accurate proportions, then has to be used within two hours as it hardens slowly but surely.
I first tried a very small quantity (20g+2g) to get familiarised with the product. To me the compound didn't seems as free flowing as I had thought but it is surely tsicking to everything it sees. So I'm working with latex gloves not to get it on the hands, but it's impossible to keep it of the tools.
I first installed the stiffeners using the following sequence: first a bit of proseal in the dimple, then the rivet in the dimple, then the stiffener get proseal on the contact flange, it gets put into position and back riveted. The proseal oozes out from everywhere, but before cleaning, nice fillets are formed around the stiffeners and every rivet get a blob of proseal on the factory shop. Here is the result



After the stiffeners, I riveted the fuel caps, not forgetting the vent line attach clip.



I also riveted the drain valve support. To be noted the free path between the proseal blobs on each rivet to allow water to go all the way to the drain.



Today I did all this on the left tank, on the right I only did the cap and the drain before cleaning the tools and the tank skins.

After one hour of work, all is finally ready to begin assemblin the fuel tanks. The first parts that get riveted are the stiffeners, so I applied along where they go some electric tape so as not to smear everything with proseal. I also cleaned everything with acetone, I'll do a second pass tomorrow before beginning the actual assembly.

After today's session the tanks are almost ready for assembly. First I assembled the left tank fuel sender, it will be in the second bay.



Then I finished the first bay by fabricating the small strips that will prevent the flop-tube to get stuck in the corners.



The right fuel tank also gets a fuel sender, but as the pick-up is more conventional, the sender is in the first bay. I finished the day by deburring all the dimples (sounds a bit strange), this will allow for the thickness of the proseal under the rivet head while allowing the rivet head to still remain flush with the skin.