I agree with everything Tony has mentioned above, informative and easy to understand. Contact the paint supplier.
General rule of thumb, if paint is not thinned down enough it generally won't spray and goes on thick, if thinned too much will run easily on the finished product.
Temperature when spraying is also important.
I use my wifes digital kitchen scales for measuring out the paint, flatening base and thinners, that way I get the mix correct every time.
To save money on mixing cups etc, I also use 2Lt empty (and thouroughly washed) square milk containers. They are light weight, fit on the scales, square shape assists with pouring paint into gun, and when finished with go in the bin.
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