Inhibitor spray

[Moonwalker]

I have not sprayed any oil on the outboard engines yet and although they are still like new I think its better to do some protection.
So what is the best protection oil/spray to use for the outboard engine?
A shop offered me GT85 (http://www.gt85.co.uk/) but need some feedback before spraying on my motors.
A friend told me that there is a spray called Inhibitor. Any feedback please?