Putting a 2 pack clear on a non 2 pack colour can lead to issues, (putting a harder paint on a softer base) best stick to same paint types if unsure. Results tend to be proportional to time and effort put into paint, it's perhaps 80% preparation, 10% application and 10% flatting and polishing afterwards. All three can go wrong....
If using rattle cans I'd suggest the pro-xl range, they are generally excellent. The hi-build primer can sometimes shrink faster than colour and clear coats however, leaving a lined or crinkled effect. I have used the non 2 pack aerosol range to paint bike and car wheels and parts giving excellent and long lasting results on many occasions. Keys to a good finish include patience (plenty!), environment and good eyesight. A love of sanding, abrading and polishing helps greatly, there's plenty of it!
Basically there's many pitfalls with paint. Having painted 100s of parts with my own gun and aerosols over the years these days I take parts to my local paint shop and point at them and describe the colour I want, I'd rather pay the money than take the grief. Having a pair of wheels painted is not expensive, even cheaper if they are sanded and prepared at home before hand....
hth.
