1. Cut a slot into the horizontal mortar joint using a wall chaser
2. Clean the slot with a vacuum and thoroughly flush with water
3. Insert a bead of Bond Flex into the back of the slot using a Bond Flex gun kit
4. Push the Bar Flex into the Bond Flex at the back of the slot
5. Insert a bead of Bond Flex over the exposed Bar Flex and iron into the slot using a finger trowel
6. Point of fill the joint and leave ready for any decoration