I’m gradually working on the right tank to bring it up to the same stage as the left tank. So after masking up the stiffener locations, time for more Proseal!

Proseal applied using the Sealant Gun, about 10g per stiffener.

Smoothed out with a stick.

Back-Riveted. Nearly had a disaster on one rivet by almost forgetting to move the plate under the skin!

Using the sealant gun to seal up the shop heads. The gun is the best thing since sliced bread!

Masking removed and no mess : )

Masked up ready for the ribs.

Small inner rib first.

Proseal getting angry, but who cares … it’s on the masking!

10mm radius fillet formed on inner edge to seal the flange gaps in the rib.

Masking removed whilst the sealant is still wet. Next morning, when the sealant was still malleable, I made sure the sealant was clear of all Nutplates locations.