Latex ?
I have not gotten to the clear coat stage yet, but have acquired some water-based Varathane Diamond floor finish urethane which is supposed to make a good clear coat. It is available in gloss or satin. If I use it at all, I will be using the satin, as I am finishing in a military pattern. Since I fly some diesels, I should not need to clear coat the latex, but I have been thinking about using it, anyway (just in case I later want to retrofit a glow engine).