Can this be used on an interior wall to fill a small gap between drywall and exposed brick before painting the brick? What is the cure time before ?

Thank you for te question. If you are caulking a joint ten using QUAD MAX is suitable keeping in mind that you want to seal the joint/gap not fill it. Cure time is approximately 24-72 hours and is dependent on temperature, humidity and depth of sealant applied. In normal applications of proper joint design painting can be done anywhere from 1 to 3 days with a latex primer or paint when sealant is fully cured.