5200 is about the worst choice possible, as the OP has discovered. No UV resistance for one thing. It does sound like the frames are leaking, but at the very least the glass needs rebedding, using a poly sulfide glazing compound or butyl rubber. Whichever the root cause is, unless it is done the right way you accomplish nothing. Merely swabbing some sort of caulk around the window is a losing effort. Any kind of knowledgable buyer or their surveyor will see through the shoddy fix in an instant.
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