do i have to use hobby spray paint

[Bondonutz]

Agreed, the RM is equivelent to B-Dog. And even cheaper if purchased by sprayable Qt.
I wouldn't bet to much on the single stage, It's much more of a solid based paint verses the BC, much like a enamel in a spray bomb. When wanting a long lasting paint job It must stick well,(obvisously) So the most impotant thing is; "Less is Better" when pertaining to a catalysed paint. Because it gets to hard/brittle.