got all the sanding,priming,sealing,ready for paint ,the color i'm thinking on using is : gloss royal blue rustoleum oil base paint,,,,,the color i'm hoping on getting if i can mix this white paint with : is a sky blue, the problem i'm having is i cannot get a white rustoleum in gloss,the question i have is : is it possible to mix flat white with this blue , to make it sky blue or close,or do i have to keep looking for gloss white? any help would be appreciated ...thanks