I recommend making sure the clear is compatible with the rattle can paint - just to be on the safe side.

My own personal experience with air brushing:

- I use a cheap airbrush with a cheap pancake compressor. No problem there.

- Make sure the acrylic is thin enough. The Golden fluid acrylics flow great. The Createx require for me dilution with, say, Windex.

- Multiple light coats work much better. Spraying too thick leads to paint accumulating near the frisket and raised edges and the paint being un-necessarily thick. And that's really where having to spray large areas can be a real pain and take forever because you need to go over the area multiple time.

- Spray a light coat of white before the color.

An alternative to the rattle can, if you need to match the color for instance, could be to use a touch up spray gun - https://www.harborfreight.com/hvlp-detail-spray-gun-46719.html

I couldn't spray a decent coat of clear to save my life but airbrushing is much much simpler.