If you use the proper primers for the subtrate to be painted, you can put whatever you like on them. I have painted wood furniture with automotive urethanes before. Comes out nice. I guess you could do your patio set in a wild-a$$ color if you wished.

Jim

"Every normal man must be tempted at times to spit upon his hands, hoist the black flag, and begin slitting throats".--H.L. Mencken Bumper sticker, OXYMORON #65 - Liberal Thinker