I have been searching through other threads, and am still confused on finishing with poly or nitro to produce a solid color. I understand that you should first fill the grain with an oil based grain filler, and then seal it with a sanding sealer. Now what I don't understand is, to apply a solid color to the guitar, do you use paint (if so, what kind/base of paint is compatable with polyurethane or nitrocellulose) or is the poly/nitro stained with a pigment to produce the solid color. If this is the case, is there any information on what kind/base of stain to use and how to mix the pigment with poly/nitro in order to produce a solid color as opposed to a see through color (i.e. I don't want the wood grain to show). From my research, I have concluded that acrylic or acrylic enamel paints are not compatable with the finishes. I appreciate the help.