Workers with Circle C Paving of Goddard began seal coating the east half of Hillsboro?s Main Street on Monday, plus the entire 100 block of East Grand Avenue. The Axys mastic surface treatment was sprayed onto the streets primarily by truck, but some manual application was required to cover corner areas. The company was to seal coat the west half of Main Street and the entire 100 block of West Grand on Tuesday. The project, postponed several days because of rain, required no parking in the targeted area during the day. City officials said the project is ?an important maintenance project to extend the life of those streets.?