Why I cant paint my interior faces with default material in this

And why sometimes seems like there are only one face? like, a change the interior and the exterior changes too… :thinking:

test a.skp (12.6 MB)
Iam sharing the model to help

Unfortunately, I can’t play your video - all I get is a blank dark window.

Looking at your model, the problem is that you have painted the faces inside the leg with a gray color. That takes dominance over any material you apply to the group as a whole. Compare the faces inside that group with those in the other legs and you will see that all the others have the faces with the default material, not that gray.

And this might help.

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