What should you use to ensure snapped lines do not disappear?

• A. Chalk
• B. Tape
• C. Sealant
• D. Bond breaker

Answer: (D)

Bond breaker is a release agent placed on the form surface to prevent the concrete from bonding to it. When you snap lines on the form to guide panel placement, you want those lines to stay legible after the pour and form removal. The bond breaker creates a slick barrier that reduces adhesion, so the line markings aren’t smeared into the concrete or dragged off during stripping and finishing. Chalk lines can wash away or smear, tape can peel or disappear, and sealant isn’t used for this purpose. A bond breaker specifically prevents bonding between the form and concrete, helping the snapped lines remain visible for accurate alignment and cleanup.