Cheers Will.
I was thinking that seems a bit like the lithium spray I have a can of, so while looking for that, in the shed I found a can of the very stuff you describe - purchased from Aldi months back, never used and forgotten about. PTFE, by 3-in-1. Just waiting for the sun to go down.
Thanks.
(I was thinking the lithium would be a bit thick for the ignition anyway.)