Morning Barry.Absolutely correct John. But clearly you have not tried MRP because they actually do what they say they will do. I have never once thinned them even doing mottle, never had tip dry either.
The first thing I would have to ask does it smell and what type of paint is it ?
These days I try to stay away from any strong fumes, having at time refinished and made various items of furniture, although wearing a mask and having a proper spray room .