You should be able to flat out any blemishes with some 1200 /1500 wet and dry put a few drops of soap /washing up liquid in the water to act as a lubricant.
Don't be tempted to do it too early wait a few days for the paint to fully harden.
Then compound /Tcut to bring the gloss back that's exactly what top end painters do .
Theirs always a risk of breaking through with rattle can type jobs because the paint is usually quite thin as opposed to professional 2 pack systems .
If you do breakthrough just re rubdown and paint again the key is to get everything smooth and clean use panel wipe and get some tack rags any paint supplier will have them .
Some of those auto parts places have quite well stocked paint supplies sections .
Use rubber gloves when you give the part the final clean before painting as your hands have oils on them which can contaminate the piece your working on.
The area or room you use needs to be draught free to prevent dust and debris getting on your work .
If you prepare everything correctly you should be able to get really good results.
Good luck and put some photos up when its done.
