I guess that's a million dollar question without trying it, but I've had more success with the BIN product......slightly more expensive, shellac based with meths as a solvent.
After keying the surface, it stuck well to uPVC (changing brown to white) and also metal priming.
Vital to allow full drying time though!
John
You can get it tinted (in a proper decorators' merchant), meaning that you don't need the eggshell. The eggshell would be the weaker link. BIN cures after about three days which is faster than waterbased egghsell.
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