Oh come on now... leave the future for the floors! J/K
Max, what the problem is - the paint is drying before it can settle onto the object.
Yes enamels can do that too, just like acyrlics. Some enamels are fast drying and then when you thin them out more they can dry even quicker especially when finely atomized from an airbrush.
Not knowing your specifics on how you mixed the paint (ratio), air pressure, spraying distance, humidity, temperature, etc... I'll give a few basics to look out for and what can have the most effect on the rough sandpaper like finish.
- Paint thinned too much
- Too high of air pressure
- Spraying too far from the subject
- Temperature too high (unlikely though)
- Must spray a "light" mist coat first
- The color coat must be "wet", just shy of dripping
A mist coat is just a very light coat of the final color paint sprayed on so it is almost transparent. While it is slightly "tacky" that is when you spray your wet color coat. The purpose of the mist coat is to adhere to the surface and give the next layer of paint something to hold on to. As far as spraying the color coat just shy of dripping, you can spray it in layers. Just as a layer gets tacky, spray again. It's worked for me for many years even when I was using spray cans. It took me awhile to get the hang of an airbrush. I was used to cans for models and big spray guns for cars. Once you get the combination somewhat worked out it will flow with ease from then on.