Last December, I had my son (who has equipment and is far better at it than I) paint two bicycles for me with automotive paint. One thing that I learned while shopping for the paint is that there are cons - as well as pros - to clearcoating. They are prone to scratching, and you will only make things worse if you try to undo the scratches using a rubbing or polishing compound. I didn't apply any decals to either of those two bicycles, and decided to not go the route of clearcoating. On the other hand, I did apply a 2K clear on a different bicycle that I painted.

You DEFINITELY need to follow the safety precautions. Even with a pretty serious respirator mask and applying it outdoors, the fumes were very strong, and I had to take micro-breaks to let the air clear as I was spraying.