Unless your's is different than most of the Journey's, it's not Dupont Corian it is a plastic material called Swanstone. Lowe's can order the Swanstone material but not sure about repair kits.
Also, you might want to check Vendura.com. They make the stuff for Winne and I suspect they might have info on repairs.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.