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The term acrylic with paint refers to acrylic resin dispersion added to an enamel base. This addition speeds up the drying time considerably. Straight enamels did take a long time to set up unless they were force dried which was practiced by all manufacturers that used it before the addition of acrylic resins. Acrylic enamel can also be force dried if the manufacturers instructions are followed. Now days you have to really look at the manufacturers instructions to see if it is a water base or solvent base since they are two different critters. Most stuff went to water base due to the EPA's problem with solvent based materials being sprayed into the atmosphere.
When hardener additives first came along, they were added to the solvent based acrylic enamels. Hardener added in changed the paint formula from a straight acrylic enamel to an acrylic urethane formula. With water based acrylics, it's not so easy to figure out what the hardener is as it used to be so it's even more important to follow manufacturers instructions with it. Most folks use base coat/clear coat now so they aren't as popular as they used to be and therefor not supported as well as they used to be.
I like the PPG Concept acrylic urethane. The rest of their products are an unknown to me since things have changed in the paint world so much over the past 20 years. They are talking about doing away with it so what to do next?