The contact cement capsules have dried out and aren't useable. I bought some new contact cement at Home Depot.
If you've never used contact cement before -
You apply the glue to both parts and let it dry. When the dried glue touches the other glued part, it grabs and holds strong.
There is a good reason why it is called "contact" cement.
The support ring is centered in the bottom hull half and the perimeter is traced with pencil. Center and trace the ring on the upper and lower hull halves.
A ring of contact cement is brushed on the pencil line.
Contact cement is applied to the edge of the support ring and allowed to dry.
Center the ring inside the pencil line and press into the hull.
Here the lower edge of the support ring is set and glued in place.
Apply contact cement to the upper edge of the support ring and inside the pencil line in the upper half.
Fit, press and join the two hull halves together adhering the support ring in place.
Held up to a light you can see the ring inside the round hull.
Run liquid plastic cement inside the overlapping joint.
Dip and push the brush into the seam as best as you can.
