yeah, they run exactly this scam
"Blair said, as was the case with the Randolph incident involving paving a driveway, "They tell their victims a story about having too much material left over from their last paving job, and how their bosses will fire them if they come back with it because it can’t be returned to the asphalt plant. After convincing the homeowner that their driveway is in desperate need of repaving, they will then offer the victim a ‘deal of a lifetime,’ just so they can keep their job."
The victim gets a thin coat of a driveway sealer or, at best, a very thin coat of asphalt which soon begins to deteriorate and crumble apart.
"Any work performed by the Travelers is suspect and shoddy. They use inadequate and inferior materials, and often leave the residence before their ‘work’ is completed, leaving the homeowner to have to hire someone else to correct and clean up the mess," he noted.
source http://www.courier-tribune.com/news/local/beware-irish-travelers-scam