When I replaced the gaskets on my aluminum skylights, the company insisted
that only Silaprene would do the job. I couldn't find it anywhere and
bought a tube from them for 20 bucks. So far (two seasons), no sign of the
gaskets coming loose. It's used a lot to attach window glazing into high
rise curtain walls if I remember the refererences during my search
correctly.

--
Roger Long