All paint manufacturers have a flattening agent. You add this in to your top coat clear. Yes it will protect you from the sun. You can control the amount of dullness to some extent by the mix ratio. I have always wanted to try a high shine paint job with flat same color graphics on top.
Kroozn is a paint instructor and fuzzy is the paint award wining calendar boy.
They need to be answering the paint questions.
I believe some shops have found a millitary flat black that they are useing. ???