Substrates must be level, solid, load-bearing, clean, dry or slightly damp, and must have been pre-treated with a suitable Ceresit primer. Chamfer all edges at an angle of 45°. Cove inner corners with a scotia of at least 4 cm radius using either CT 23 Repair Mortar (drying time approx. 3-4 hours) or Ceresit CP 43 (max. 2 cm radius, drying time at least 12 hours). Please refer to the Technical Data Sheets of CP 41 Bitumen Emulsion or CO 81 Silicifying Fluid for further information on priming and substrate preparation. Use CP 50 Joint Sealing Tape to prepare movement and separation joints between buildings.