Ha, I got told that, waterproof but keep it dry, eh??
The IP65 thing seems to be ok as long as I dont jet wash it clean!
Hi Mr G IP65 rated enclosures are water resistant to water continuously sprayed from any direction for 15 minutes. The highest water resistance rating is IP67 which are resistant for up to 30 minutes. Some of the top end mobiles claim to be IP67 but immersion will damage the phone as water would get into the charger point
So the controller would be resistant to rain showers. The controller is widely used in The States with systems on open bed trucks with little issue.
Some tips would be wipe any standing water of the top of a controller. where we see water ingress its often due to water being left pooled on the top for long periods and eventually water will find a way in.
On occasions we have seen controllers that have had holes drilled into them inside the IP65 seal.
All the controllers have moulded mounting points outside of the IP65 seal.