Food dehydrator to dry scale model cars..

One way to minimize the crazing is to do a couple of "dust coats" of primer over the whole body, inside and out.

Luis,
I can get acrylic paint cans at a local hardware store, but I usually get my paints from the local Auto-Pro store.
They have a range of touch-up paints that are pre-mixed to car manufacturer's specs, but they also have color charts and can mix up a batch of paint to any color that any paint manufacturer has ever made - or at least one that has been published.
DuPont, PPG, Ditzler, BMC (and many many more) have all published their paint mixing recipes ....and if you need a color for a particular car, be it Toyota, Chevrolet, Ferrari ...whoever - if you have a year and a model, they can mix the right color for you.
I've done this many times, and it has always worked out.

are these paints only available in autostores?

I've used a food dehydrator before - and it DID work well to dry enamel paint - but I had difficulty from excluding dust from the process - meaning that I was better off painting the car body and putting it under a plastic bowl.

Took longer to dry, but at least I didn't have to sand out dust specs.

Normally, I use automotive acrylic for car models.  Either from a spray can, or straight from the paint can, thinned with the appropriate thinners.

Remember, they're "hot", and can craze polystyrene plastic, but I've never had any problems, as long as I use a compatible primer.  Just don't spray heavy coats and you should be fine.

The stuff dries very hard and very thin, but it also dries very quickly - and can be polished using normal auto polishes.

I use automotive acrylic exclusively when I'm painting airliners - you can paint at night, then polish and decal in the morning without having to worry about killing your paint job.