Hello! I am making a tintmask for a Warframe helmet. For some reason, even though my blue and green are set to Screen, they are not blending with each other/red after being exported. I included all the useful screenshots I could think of. I've tried a bunch of things, including setting the fill layers to screen as well, but no dice.
Here is a link that tries to explain how to make it work, but I tried their way many times with no luck.
http://www.warframe.com/steamworkshop/help/index.php?page=substance-painter-shader
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I know that this doesn't directly answer your question, but at the very least it might help you simplify your process.