A synchronized-width fluid material spreading system carried by a vehicle carrying at least a triggering fluid material capable of being applied to a vehicle travel surface and at least one slave fluid material carried on said vehicle capable of being applied to said vehicle travel surface, said system comprising:
- a triggering fluid material application device supported on said vehicle and communicating with said triggering fluid material;
- at least one slave fluid material application device supported on said vehicle communicating with said slave fluid material for application of said slave fluid material to said vehicle travel surface, and
- a controller coupled to said triggering fluid application device and said slave fluid application device, said controller having at least one user actuatable control thereon for turning on said triggering and slave fluid material application devices and controlling a spread width of said slave material applied in response to a spread width application of said triggering fluid material on said vehicle travel surface.