Brian I have made several oilers over the years using the Slo Zap super glue. This does not fog and no I've not had any fail though oil. Sometines the glue does become a bit brittle with age and a slight knock might unseat it but it is soon re- glued.

I must point out though I have not used glass but clear plastic tube – either the clear tube that protects artist type paint brushes or the clear tubular enclosures that some cutting tools have. I have used glass on the aquariums on the Corliss engine.

Tug

As we have moved on to Loctite, may I mention that 603 is also tolerant of surfaces which are not "consistently clean" and it can be used for gluing oil impregnated bushes into housings.

According to the data sheets, 601, 603 and 638 all appear to have similar resistance to oil after cure.

Araldite is also fuel and oil proof once cured. The nromal cure stuff not the rapid one.