I'm in France too, never found Sprayon either. But I've found this : http://fr.farnell.com/jelt/8461/vernis- ... nis%20jelt
I've used it to coat my Mxus hub, it seems fine. It's expensive, but it's the most heat resistant I could find (3M 1601 is 120°C max, 1602/3/4 are 120°C max, Jelt V991 is 190°C). You could probably make 3M 160X (not 1601) work, but I decided to play it safe.
Plastidip also offer an isolating spray but say nothing on the temperature resistance.