Yes,The loctite from farnell is the no-risk real deal, but I just used selleys "roof and gutter" silicone sealant (non acidic), available from any hardware store. Black is probably best, but translucent worked for me.
Acidic is best for glass, but corrosive, so IMO, since yr sealing glass to a metal frame, non acidic is the go. It's not a high strength application.
I use the above silicone all the time for general electronics repair at work without any trouble. I did have some grief with the acidic version at the beginning with corrosion, so I stopped using that.
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