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.

Click here for next page
Click here to return to New Construction Application Guide

Distributor/Sales Rep Locator

Sales Rep

Technical Services

Let our tech service experts help make your project a success.

Click or call (800) 523-6688.

Pecora Calculator

Calculate material needs for Coatings, Sealants and Air Barriers.

Launch Calculator

Pecora Calculator
Air Barrier
Enter Data:
Select Product

Required Dry Mil Coverage (mils)

Total Sq. Ft. Of Project

Estimated Waste (%):
Coverage Rate(Wet):
Sq. Ft./Gallon


Materials Required

To use: Enter values and press "Update" to recalculate. These calculators also update when you tab to the next field or click elsewhere in the page.