Are you going to use the Kart Enough to warrent spending a ton of cash on the paint?
Look into having it powder coated. I'll bet its just a tad more than paint.
Or if it was my kart and I wanted it pink
And I wanted to drive it in the woods....
Id use 4-5 cans of Krylon 3533 watermelon outdoor paint and Then clearcoat it with duplicolor EFFEX clearcoat.
Im sure you could do the whole cart for $40.