Art,,, It's all art/ LOL not for real... In my case. The Krylon for plastic paints is what I use. Use the yellow Duck tape for masking.... It will not pull the paint off the foam as easy.... and 3rd, I use water transfer paper for the Inkjet printer for decals...... You got to clear coat them after you print them or when you put them into water to transfer them, the ink will wash off. Also I have the circuit vinyl cutting machine for some things but the decal paper works best.
Here is an example of some of my from scratch work using nor more than I mention in this post.
Both Dyman ARF out of the box kits. Reds are Krylon and decals are Ink Jet water transfer paper.