I use the same Clear and mostly to get powder paint that is more thick to fluff easier. Some paint just is too hard to get the air to flow through very well, but adding a little Clear will fix that right up. There are a few colors that you have to be careful with adding Clear, like Chrome is not one I add to and there are a couple more that don't like the outcome. Some guys make their paint 50/50, but I never add that much personally as there is no need to add that much IMHO and am sure since some do that they will tell you they like it better that way. Like most things in this hobby, it's all personal what and how you do it.

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