On 08/10/2020 00:13:03, Fredxx wrote:
This will be external use where one I have one telescopic style of an
extension piece, where one box section slides in another, and a swivel
joint.

So far I was thinking of PTFE grease. I can't find any graphite grease
locally but see that Screwfix does a Molyslip type grease.

What would be best?

Many thanks, I hadn't thought of silicone spray.

In the end I got:
https://www.screwfix.com/p/flomasta-...ay-200ml/6699x

Given it should be water repellent and non-staining it seems an ideal
candidate.