Changing texture setup from tiled to apply decals

I'm a real newbie to Substance Painter and 3D as a whole so I may be trying to walk before I can crawl here and may not be asking the right the question. I am creating a racecar livery design for a client and found that working in the 3D realm is so much easier to visualize the finished car wrap. I imported the model into SP and it seems that all the carbon parts are setup in tiles. When I add the carbon material it tiles just fine. I'm finding that when I want to paint a decal over the carbon texture it is tiling also. Is this something that I can change in SP or is it to do with the original setup of the meshes?