Del-Val 211 Flashing Cement - 5 Gallon Pail
Kill Two Birds with One Stone!

Del-Val 232

Modified Aluminum Mastic

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. Del-Val 232 Modified Aluminum Mastic is a single component, SBS polymer modified asphalt blended with aluminum pigment and specialty fibers. The elastic properties provide great strength and elongation.

Add reflectivity to your roof while you repair! A one-step application saves time and leaves your finished project looking as great as it is strong and elastic.

Where to Use Del-Val 232 Modified Aluminum Mastic
Roof Repairs
Attaching Roof Membranes
Parapet Walls

Quick Application Guide

Min Mil Thickness


Apply with Trowel

Larger Areas


Embed with Fabric

Coverage Rate


Per Square (Per Coat)


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.

Make Your Repairs, Then Coat Your Roof:

Del-Val 305 SBS Modified Aluminum Roof Coating in 5 Gallon Pail

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SBS Modified Aluminum Roof Coating

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Product Information

Sizes Available

1 Gallon Capacity Pail
3 Gallon Capacity Pail

Tools Needed

Brush Tool Graphic
Spackle Knife Tool Graphic
Trowel Tool Graphic


Available From These Distributors

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