Etching tiles with multi-color (painted layers)

I keep having to up the anti. First it was white tiles with one color or paint. Then white tile with two colors of paint. Now I am trying white tile with FOUR colors of paint and some with three. I will be laying down a combination of yellow, orange, red, and black. Also yellow, green, and black. The idea is to burn through the black to show the color under it. Also to burn through that color to reveal the color under that and so on until you get down to the white tile.
I wanted to try doing the sun tile again with the yellow, orange, red, and black paint. That way as I burned deeper into the paint, it would look like the hotter parts of the sun.
There were two major mistakes I made with this project. The first was to not wait long enough between layers of paint. This caused the next layers to interact with the layer under it to make it look cracked. The yellow also spat out of the cat at first. I had not had this happen before. I knew it could be an issue and that is why you should always do a quick test spray from the can to insure a fine mist before you spit paint onto your target.
In addition to not waiting long enough between layers was to put a NON-WATER BASED clear finish on the tiles. This also reacts with the paint and bubbles it up. Kind of like putting lacquer thinner on paint to remove it. The textures look is kind of cool but not what I was going for.
I came across some issues with the paint and contacted Rust-Oleum about it. Here is what they said:
Per Tiffany at Rust-Oleum

Aerosol paints will dry by oxidation. A skin forms on the surface, and then gets thicker as the solvent evaporates from the paint below the skin until eventually it is fully cured all the way through the coating. If you recoat the paint before it has skinned over and begun to dry to the touch, the two paints dry like a single coat of paint. This skin-free time varies from paint to paint, but is usually about an hour or so at room temperature.
After the skin has started to form it is very fragile and if recoated at the wrong time is may wrinkle, blister or crack. For your products, the recoat time is within 1 hour or after 48 hours. Deviating from that will cause wrinkling. If the time between coatings did follow the recommended times, a thicker application or environmental factors such as temperature or humidity could have interfered.

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