Short Business Description For more than 20 years, Cassidy Painting has provided the painting contractors Wilmington Delaware trusts for its toughest jobs. We can help you breathe new life into your building and equipment by restoring your exteriors to their former glory. And thanks to our reputation for quality, the best painting contractors in Wilmington now travel all over the Mid-Atlantic region to serve companies in NJ, PA, DE, MD, and all over the East Coast.