Hey Don, Real G, as for yellow, it can be a three-step process:
To add to Blacksheep's mention,
- If you're not already there, first you go to a flat light grey, as a primer. If the kit is already light grey, but a shiney finish. make it dull with a fine-grade sand-paper.
- Then you go to a flat white, as a second undercoat.
- Then I go to a flat yellow because it dries faster, and it doesn't hurt to sand any areas where the paint may have gotten "lumpy".
Then if I want a gloss finish, I clear-coat it.
The two-step priming keeps a dark color, like the Forrest Green of the old ITC Martin B-2, from bleeding through the top wing's yellow finish.
Now notice, if you want to stop with white, or a light grey, but want a gloss finish, then simply clear-coat the flat color.
That also generally takes care of all my gloss-paints issue for water-based acrylics including the light-grey fuselage of the Sparrow Hawk kit I built from a Williams Bros. kit, many years ago that was molded in white.
By the way, for black, maybe you should try flat-black+clear-coat.
Tom T
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