Flex Seal signs deal with JD Motorsports Swift Response LLC, makers of Flex Seal has completed a deal to partner with JD Motorsports for the 2013 NASCAR Nationwide Series season. The relationship will kick off at Daytona, by sponsoring the No. 4 Flex Seal Chevrolet driven by Danny Efland in this weekend’s DRIVE4COPD 300, at Daytona International Speedway. Flex Seal will also be the Associate Sponsor of the No. 01 car driven by Efland’s teammate Mike Wallace in the same race.