^^^ Never ever.
Ironically the first thing you need to paint Iyaden (or any yellow-based army, really) is the Iyanden Darksun foundation paint. Two coats over black and there was little, if any, black leaking through. Even if there was, between the wash and more coats of Darksun it was pretty much taken care of.
I'll post the recipes for the painted areas, but keep in mind that this is very basic and is generally going for a contrast on a macro level, hence no highlighting:
1. First of all, start by priming black (I used Krylon Flat Black spray. Really good stuff and cheap as well). Don't forget to thin your paints.
2. The yellow:
a. Two coats of Iyanden Darksun. Go for a third coat if you think some areas need more coverage or if you watered down the paint too much.
b. 1 and a half washes of Gryphonne Sepia. I've seen other people use Devlan Mud or Badab Black, just depends on the look and contrast you're going for. I prefer Sepia, but that's me. By 1 and 1/2 I mean to wash the entire model the first time, and the go over the specific areas where the wash pooled unevenly or didn't pool at all. In retrospect I probably should've used Chestnut Ink...
c. Go over all the areas aside from the crevices or places where you have other colors planned with more Iyanden Darksun. This is meant to clean up any spillover from the washes.
d. Next, go over
most of the same areas with a 1:1 mix of Iyanden Darksun and Sunburst Yellow. You might need to do a few coats of this; I did two myself.
e. Finally, go over the areas with pure Sunburst Yellow; basically just hit any areas that show(/are lit) up on the model when you have a lamp directly over it.
f. If you want to go the extra mile for highlights, use a 1:1 mix of Sunburst Yellow and Bleached Bone.
2. The blue, my favorite part.
a. Basecoat Mordian Blue. Should only take 1 coat or so.
b. Wash with Leviathan Purple in the crevices.
c. Cover non-crevice areas with Enchanted Blue. That's it.
d. Again, if you want to go further you can mix the Enchanted Blue with Ice Blue or Bleached Bone and highlight.
3. The Black
a. Go over any areas that will be black with Chaos Black (in case you accidentally got some yellow daubed on it earlier)
b. Paint the areas with a 2:1 mix of Chaos Black and Astronomica Grey
c. Wash with Badab Black.
4. The base - I'm not entirely pleased with how it came out, but here's how it went:
a. Basecoat 'stone' areas with Astronomica Grey, the little dot Dark Angels Green, and the 'dirt' areas with Bestial Brown.
b. Wash with Badab Black (I probably should've gone with Devlan Mud)
c. Drybrush with Astronomica Grey, and then Bleached Bone.
For anyone who's curious, the base is from
Dragon Forge Bases' Lost Empire Series.