Acrylic latex enamel should be in the same class as latex house paints, and so would probably be water-based (you didn't say what brand or make). Try stirring a small amount of paint in a palette or cup with water and see if both mix well. If they do, then water is your thinner for that paint. I've read of a guy in this forum who airbrushes water-based latex paints for his R/C creations, so it should work well for you, too.
Cheers,
onyan