ORIGINAL: AJsToyz
Two differant animals, surprised it works. Acrylic hardener is meant for acrylic enamel. Unless Rustoleum has changed over the years it is alkyd based would require an alkyd hardener.
The guys at the auto paint store said the same thing. They were interested, though, when they found out that it does work.
I'm a paint guy, having been in the manufacturing end for over 30 years. I'm not big into adding unknown additives in to my paint. I was hesitant to try it, but a couple friends had success with it. I tried it only after their success.
Rustoleum says that their paint can be thinned with acetone or mineral spirits.
The mineral spirits is not strong enough to cut the hardener. The resulting paint job is terrible.
The acetone cuts the hardener well, but the paint flashes off a bit faster.
I've painted three models in this manner. I'm quite pleased with the outcome.