Fill a wireframe with a material? I would like to make a wireframe solid when using a specific Material and be a wireframe when not. Right now I have a normal Wireframe:

And I would like to have it look filled with the same color, but a different material: 

This is just in edit mode but I would like to have it look like this. I found something about this already but since I'm fairly new to blender I don't understand what they do at all. How to make a material switching from Wire frame material to surface material?

I will keep on trying to understand what they are doing, but if there is a better way to do it, please let me know.
I guess you are using the Wireframe modifier. Instead use the Wireframe input Node to affect a Mix Shader Node

Here we have a Diffuse BSDF Node (Red) and a Transparent Shader mixed together. Without a Factor they will blend together to a pale Red.
With the Wireframe input as the factor only where the wireframe exists is Red, everywhere else is 100% transparent


As the geometry is not affected another material on the smae or duplicate object can be just solid.