Hey,
I’m doing another tutorial with Blender Guru about the abandoned house
and I’m stuck with the texture painting vis RGB
each color should represent a diffrernt material
but somehow only R works
im working with POLLIGON MIXER
Maybe you should rearrange your nodes…?? Because it seems your screen is too small for this… so you are lost … or do you expect someone to stick this together o have closer look at it… ? Maybe even collapsing would help… 
You seem to be using the Add blending mode. I’m pretty sure Andrew used the Mix blending mode which replaces the original color with the one you’re painting instead of mixing them together to produce a different one (e.g red + blue = magenta). Check the actual image in an image editor panel to see what the colors are doing.
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