I'd say that is a little conservative. I've never had a problem under 65% or soI know humidity shouldn’t be over ~55% when spraying. Is that for the actual moment of spraying or for the whole procces?
In other words:
Let’s say humidity is 50% for 3 hours around noon. But is a lot higher in the morning and evening. Can i do three coats in one or two hours while the air is dry and then let it sit over night?
Never had to deal with this before because i had access to a proper facility. I don’t have that anymore...