Cut away failed sealant as close as possible to the joint edge and remove all existing sealant and backing materials.
Clean all joints of contaminants and impurities to the depth at which the new sealant and sealant backing are to be installed. This may be accomplished by the following methods:
Porous Substrates: Diamond grinding for concrete, masonry, brick and similar porous substrates to expose virgin substrate.
Non-Porous Substrates: Razor knife for non-porous substrates such as metal and glass followed by a solvent wipe to remove most if not all residual sealant.
EIFS Substrates: Extreme caution must be taken when restoring EIFS joints. Sealant must be removed by razor knife only in order to maintain an undamaged EIFS substrate surface. Grinding is prohibited.
The Pecora Silspan EIFS restoration system may be utilized in order to prevent any substrate damage possibly caused by attempting to remove existing failed sealant.
2. Surface Preparation
Blow dust, loose particles and other debris with oil-free compressed air. Make as many passes with cleaning tools and compressed air as required to ensure that joints are clean and free of existing sealing materials and/or other dirt and debris.