I did my tailgate a while back using Dupli-Color.
Came out fine, what I did was wet sand in between coats,you will have over spray, hard to get around it using a can.
I used 3k paper, I sprayed 6 coats of paint and 6 coats of clear.
A lot of sanding but it's a quick sand, just enough to knockdown the high spots and over spray , that's where the roughness comes in.

I let it cure three days then used 105, 205 but didn't wax or seal, let it cure at least 30 days before you wax it.
It's been about 4 months now and holding up great.