yellow paint is the worst

if your using testors acrylic yellow then just shake really well, I mean really well. Shake the hell out or that thing till it hurts. it make the paint thick and mixes it well. if that doesn't work then I would try priming the item your painting first.

Last time I use yellow I had to do like 40 layers!

cool thank you

Mix a bit of white paint into the yellow.Do a coat or two of this mixture and yellow will show up much better after wards. I can get a yellow onto a red in 2 or 3 coats this way.

ok thats what I will do
I was thinking about just dipping the part I want yellow in the paint and leaving it lol

By all that's holy yellow paint is a bitc-, er, a pain... yeah. I find a nice white base (or primer as bob suggested) works wonders.

did not primer this one it seemed to take the red perfect so I didn't see a need until I got to the yellow and yeah im on like 4-5 layers of it now and it still don't look right

Yellow is a pain(as well as white and metallic paints).
Did you primer the item you are painting? It may take several coats, something I'm working on now I'm on the 5th coat and it just starting to look the way I want it. They do sell thickening agents at art and hobby stores to add to acrylic paints, never used it though.