Del-Val 232 Modified Aluminum Mastic

Product Fast Facts
Bright Aluminum Cement
Smooth Trowel Consistency
Great on Flat & Vertical Surfaces


Del-Val 232 Modified Aluminum Mastic is a premium, reflective elastomeric mastic formulated to a heavy smooth trowel consistency with great elasticity. It is a single component, SBS polymer modified asphalt blended with aluminum pigment and specialty fibers. The elastic properties provide great strength and elongation.


Del-Val 232 Modified Aluminum Mastic is used as flashing cement in any type of asphalt roof membranes where aluminum coating is present. Del-Val 232 is ideal for roof repair, attaching roofing membranes and parapet walls. Do Not Use with EPDM, PVC, TPO or other single-ply membranes.


Surface must be clean and free of dirt, dust, oil or grease and be free of any other foreign matter that would interfere with good adhesion. In colder climates we recommend storing the product at room temperature for 24 hours prior to application. Do not apply in ponding water or when water is present.


Apply with a trowel or putty knife. Spread Del-Val 232 to approximately 1/8” thickness and work thoroughly into the problem area. Repairing cracks and blisters: if the area is 1/4” wide to 2” long, apply United Asphalt Cotton or Fiberglass Fabric for reinforcement then cover with additional cement.


Approximately 8 gallons per 100 sq. ft. (per coat)

Cleanup Del-Val 232 Modified Aluminum Mastic

Clean tools with Del-Val Orange Cleaner & Degreaser or mineral spirits, taking necessary precautions when handling combustible liquids.


DO NOT THIN. DO NOT HEAT CONTAINER. Do Not store in an area where temperatures exceed 120°F.

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