What are the small cracks in my plaster from?
Known as crazing or checking, the tiny, barely visible cracks are usually caused by extreme temperature variations, especially during initial curing. These are not actually cracks, and pose no structural hazard or danger of leaking. Acid washing could remove the crazed layer. Larger cracks should be cut out in a butterfly or dovetail fashion with a 4″ or 7″ grinder, and filled with a plaster patch mix or a flexible sealant can be used where further movement is suspected.
