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Back when I worked in a photo lab, processing film we had two film processors that the chemical tanks were made of a grey plastic that felt much like teflon. No glue would stick to it at all. PCV cement was as useless as Elmers glue on it, and would just peel off. We had a slow seep from one very minor crack near the top to the fluid level. We tried everything we could find. Finally the boss came in with a can of flexseal. It just made a mess on that plastic.
We ended up having to hire a plastic welder to come fix the slow leak, and a bigger leak cause by an idiot employee hammering on the side of the tank trying to get a threaded fitting off.
It may well work for your skylight. No real pressure to hold back, just a slow leak. Just mask off the parts you don't want covered in the stuff.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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