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WD-40 is good for cleaning off parts but has to be completely removed from the surface if they are left out. It will gather dust like a magnet.
If you want to lube the o-rings, why not use an o-ring lube such as Super Lube, a synthetic grease with PTFE? The problem with using a lube is if any gets into the sealing area between the cases it will keep the sealant from adhering.
For static o-rings I use Loctite Gasket Eliminator 515. It lets the o-rings move on assembly then seals any imperfections in the surfaces. It is an anerobic so there is no assembly time constraint. 518 works better on contaminated surfaces and has a faster setting time.
If it can keep an old British motorcycle from leaking it can work on anything. A Lycoming service bulletin calls out using 515.
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