If you take in a color chip, they'll match it exactly. If you don't have a chip, stroll through a lot of other paint stores with a pic of the b-5 blue and find one that's as near as you can get. Sherwin Williams for example. Then take that in and Ace will match it.

Thin it with Mineral Spirits, odorless. I used the Ace Brand.

I don't know about the HVLP stuff. Sorry.