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Marc,
I use a simple silicone stuff, "Bostick" from memory, just make sure it is a sealant as well as an adhesive, the emphasis on adhesive (many are just sealants).
Spread a bead around the circumference, a bit in from the edge, and maybe a small dollop in the middle. When I use this to attach the primary to a cell, I normally use 3 matchsticks as spacers, so it doesn't all get squeezed out. Let it cure for a day or so, and be happy. I don't store mine with the primary facing up anyway, more on an angle or horizontal.
Gary
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