diy stucco onto concrete block
- Stucco a Masonry or Concrete Wall. To apply stucco to an existing brick, block or concrete wall, first brush a concrete bonding agent onto the wall, then allow it to dry completely. After the bonding agent has been allowed to dry, the stucco can be applied directly to the wall.o apply stucco to an existing brick, block or concrete wall, first brush a concrete bonding agent onto the wall, then allow it to dry completely. After the bonding agent has been allowed to dry, the stucco can be applied directly to the wall.