been restoring a number of VW's myself lately just did this 63 not long ago.
it was painted in RM's uno single stage and the color was a spot on match to the OE finish under the trunk lid in the trunk and dash. this was a true barn find stilling in a barn from the early 80's the down side was the barn swallow's crapped all over the car to the point the paint couldn't be saved at all.
using a paint with a hardener would really be the best way to go and if needed a paint store should be able to match the color with out a problem.
I have used Temple enamel paint's the past for some small parts interior pieces and the paint is OK.
I don't know why your paint wasn't as shinny as it needs to be? I didn't have this problem when I used it but I also didn't use it on any large parts.
when it comes to prepping for paint prep sand using 400 grit wet sand.
with all enamel's they can fisheye very easily so use a good quality pre paint cleaner.
and before you start spraying wait for about 30 minutes to be sure the solvents from the cleaner is 100% dried off the panel.
when it comes to spraying your going to want about 4 to 5 coats because your looking to color sand and buff you will be sanding off at least 1 coat maybe even two coats.
before you can color sand you will have a long wait time you will have a even longer wit time being there is no hardener in the paint. so don't be surprised if you can color sand the hood for 8 weeks or even more. the enamel will have to be 100% cured.
to see if it's cured you take your finger nail and push it into the paint if it leaves a finger nail mark it's not cured yet.
once it is cured you can do your sanding with 1500 wet paper then go back over the hood with 2000 grit.
then you can start your buffing.
again because your using a none hardened enamel you have to be easy buffing not to build much heat into the finish. if you do build to much heat the paint will move on you and could wrinkle easy.
enamel with out a hardener is a reversible product meaning it will want to turn back to a liquid state with solvents or heat in this case.
so the trick to buffing a none hardened enamel is to go slow and easy most of all be patient getting a shin back in the finish.