If you're using the cylinder PO I'm thinking of (that does NOT come bundled with the PO mod), it doesn't have any texture scaling options, so it always stretches. I don't know how to get around that.

You probably saw people stretching the PO cube(?)

Someone needs to release more procedural objects shapes with all the PO shapes' features:)

Thanks, for the reply. Yes it was the Cube, I've watched a few more vids where they slow things down so you can see how they are doing it. This only works because PO allows you to manipulate each vertex on the cube but with the cylinder you can only manipulate the face.
I was able to work around it by modifying the texture, so that the image repeated the required amount of times. it looses a little quality, but it will do until I learn Blender.