I did rattle can. Everyone will say prep work is important. Roughing up the gelcoat to make sure it adheres. If you have access to a compressor spraying off the dust from the rough up process helps. Wiping down with a damp rag helps as well and letting it dry.
I'd also practice on a throw away part. Start to finish(pre work to clear coat). So you can identify errors with your process.
Heating up the spray cans in hot water helps reduce orange peel. Immerse them in hot water. Don't boil them but use really hot tap water.
Follow the directions on the spray cans for when to apply. If you get impatient or if you don't wait long enough it can result in wrinkles or runs.
If you do it in your garage the mist will get everywhere and on everything.
If you get a run, resist the urge to touch it. No matter what, touching it will take it from a run into a disaster.
Stickers and vinyl are great to cover up mistakes.
Overall it was a fun process. I learned a lot and my next go around will be better. Don't expect it to be perfect your first go around. Take your time and enjoy the process.
Also I think I needed 6 cans of color and 3-4 cans of clear for a whole bike. I went with cheap Rust-Oleum and it did fine.
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