Substrate Surface Preparation


Substrate Surface Preparation

• Clean out joints immediately before installing joint sealants.

• Remove laitance and form-release agents from concrete.

• It is advantageous for joints of exposed aggregate in precast concrete panels to be removed or minimized to provided enhanced sealant adhesion.

• Adhesion surfaces must be clean, dry, and free of dew or frost.

• For porous substrates: oil-free compressed air, abrasive blasting, high pressure water (allow to dry), grinding, or wire brushing.

• For non-porous substrates: use the two cloth method—wipe with solvent on the first cloth immediately followed by a dry rag wipe.

See Pecora Technical Bulletin # 74- Two Cloth Cleaning Method.

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