Using Pro Form 1K Acrylic Clearcoat, Product number 12330, aerosol can.
(A little too late, I've learned aerosols are junk -- from this forum!)

Paint had been drying for about 10 days.
I wet sanded paint with 1000 and then 2000 grit.
Hosed off. Dried with microfiber cloths. Let dry several hours.
Temperature is about 80F. Humidity 60% - 70%. (Summer in So. NH, USA)
Not working in air-conditioned space.

I sprayed a coat, waited a couple of hours. Can says allow 5 minutes between coats.
Result was hazy, not glossy.
Wet sanded 2000 grit. Still hazy.

Is humidity too high - i.e. is the surface picking up water from the air?
Any harm allowing days between clearcoat coats?
Shall I sand and spray more coats?
Is buffing likely to produce a shine?

with spray cans who knows, i wouldnt ever use them.

Nothing looks glossy after 2000 grit sanding until polished.

Moisture makes it look milky. If you are spraying a lacquer if there is moisture trapped it usually dissipates if left in hot sun.

I would try and buff a spot and see what it looks like. i'm assuming its lacquer and if its blushing ( its some what glossy but has a milky color to it ). if it is, here's something you could try. you'll need to get rid of the blushing that's on there now. you could probably apply color over it but I would sand it off. when you shoot your lacquer put it on wet and smooth then watch it if it starts to blush set it out in the sun. lacquer traps moisture in hi humidity with shaker cans it may not help. I use to have a old friend that painted Harley tins with spray cans ( lacquer) they were absolutely perfect. hand rubbed an all. you didn't say but did you use a tack rag and 80 deg. is warm for cans.
Jay D.
AH Dave E. you type faster