Then get him to give it two or even three coats ~ in the heat out there it can't take more than an hour to dry anyway.
These are the facts.
"New" gadgets seldom, if ever, work the way the makers claim.
Non drip paint is a lie.
Odourless paint is another lie.
Traditional methods used by professionals are the best.
There is no finish to a decorating job that will satisfy any woman.