I can't seem to thin my paint enough to come out in any volume thru my air spray painter. Water and thinner come out fine. Directions on the paint say not to use thinner and only use 1 pint of water/ gal. of paint to thin the paint down. Also since it is winter I tried heating the paint first but had only marginal improvment. I am using a semi-gloss satin interior paint. Is there a paint especially for spray guns? Help!