Catalyzed means there's a hardener that gets mixed in before you spray. All real automotive primers, single stage paints and clear coats incorporate a hardener that catalyzes the product which is really what makes it tough and glossy as well as dry fully compared to a general purpose paint you would buy at a hardware store. I used the duplicolor stuff that centerline mentioned, which is basically the same thing as what you bought(acrylic enamel not all that different from the stuff at the hardware store). If you were happy with the results you got with the roller paint job, that is basically the same result you're going to get with this stuff in terms of durability, scratch resistance and corrosion resistance. I have sprayed cars with thinned rustoleum and really you might as well have done that instead of buying this stuff.