Flat Porch Paint by the gallon at HomeDepot.
Easy water cleanup, rolls or brushes easily and covers fast, sticks to ANYTHING, lasts long time(it's made to walk on and I have painted trailer beds with it also) and they will make any color you want.
Last time I bought some, I picked up a can of OD green flat spray paint from their rattlecan assortment and said match the cap color.
They scanned rattlecan cap and it matched well - worked like a charm.
Since I primarily hunt at night, I had them mix up a gallon of flat black for inside also!
Texans since The Old 300 in 1824
NRA Lifetime Member