Spray Patchers | Industrial Machine- Spray Injection Patching ,Spray Injection Patchers - Spray injection patching is the most cost effective method for distressed pavement repair. Ideal for potholes, deteriorated shoulders, utility cuts, fissures, and skin patching.RoadScience - Equipment WorldSpray-Injection Uses Crew of One. A step up from the truck-and-crew methods are the self-propelled units. The spray-injection patching process using a mobile unit reduces personnel used to one worker.