.. clear coat / matte finish ..

Anything getting sun needs 2k paint. Period. Get a quart setup of matte clear and a Preval Sprayer. https://www.google.com/search?q=preval+sprayer&ie=UTF-8&oe=UTF-8&hl=en&client=safari
Yes you will have plenty left over but the durability with stain/chemical and UV resistance will be unmatched. Krylon the kids' red wagon.
You will need to practice on some panels a time or two to get used to it. The qt setup will be plenty for practice and the actual paint session. Clean the sprayer with laquer thinner or gun wash.

Have fun packed with the confidence knowing that you have done the job right.
:burnout: