I have used their products a lot (building aircraft) some colors recommend a acrylic base - some an enamel. I go with whichever they recommended as I figure they have tested this stuff to see which produces the best result. After all what is having on hand an extra bottle of paint and thinner going to hurt ?
The thing to using Alclad is spraying a thin mist , the lighter you spray the better the results. Start with a coat that the only way you can tell is the object being painted looks wet with no color from the Alclad. Let it dry and hit it again the same and keep repeating . This is not a quick process but will result in the best finish..