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There's one reason why I used to love 16mm flex conduit before I had a Hilti... old construction plaster is usually thick enough to take 16mm conduit without touching the bricks. It doesn't really take more than 4 1,5mm2 wires. I once fitted 6, but it was a stright run and I had to use copious amounts of liquid soap.

Briselec,
You are absolutely right mate.
The Grey stuff is u-PVC (UV-stabilised PVC).
The Orange stuff is Chemically resistant PVC.
I have never ever seen Orange PVC conduit being painted and I mean there is HEAPS of it used over here, a lot of it by Power Companies.
I just read in AS/NZS 3000, it is supposed to be painted if not UV stabilised.
You learn something new every day.