I have an ball as an object and i would like to use a plastic like texture (the red one in the picture) and also to add a logo as a image texture. But when i combine the two of them, it's render just one or another. I try to use two different UV maps, or with a mix node, but nothing is working. Here is the image with the image texture applied.
If your logo texture is a png image, you might use the transparancy channel, to drive a color mix node in cycles. The yellow input connections of the mix node have to be connected to the two textures. The alpha output of the logo texture has to be connected to the gray factor input of the mix node. The transparency will be the trigger to mix the one or the other texture.