Problem with exported image textures

Hi,

I try to export textures, but the base color image is always grey. As you can see, the wooden part is not the right color. I use an id map to seperate the materials and I had the same problem when using two seperate objects.

Do you have any idea?

Thanks and regards

Got it, painting (fill) it on only one layer works. https://www.youtube.com/watch?v=5u0nHSDHgZc