Can caulk designed for either wood or masonry be used to fill in small holes between bricks on the outside of a chimney prior to painting the chimney? A friend is painting his stucco house and has decided to paint the brick chimney on the exterior the same color as the house. He is using a general caulk designed for either wood or masonry to fill in small areas of missing mortar between bricks before he paints the chimney. The chimney is very solid and in good condition with a few locations that are missing a little mortar between the bricks (no deep holes/areas of missing mortar). Is there a special caulk he should be using just for this type of repair or should he be using mortar in any situation involving missing mortar between chimney bricks? Any other thoughts on painting the outside of a brick chimney are welcome. Thanks for your input.