O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

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Sealmastic Emulsion




NO. 721


Three dependable application grades to meet your specification requirements.

SEALTIGHT SEALMASTIC Dampproofing Coatings are available in 3 dependable application grades for spraying, brushing or troweling.

Technical Description
SEALMASTIC Emulsion-Type Dampproofings are the breather-type which permit moisture vapor to escape through the film while remaining resistant to water penetration. This prevents blistering of applied films. They can be applied to green concrete (not totally dry).

TYPE I-SPRAY GRADE is an asphalt base, non-fibered, clay emulsion. Under normal use, it resists flow or sag. Its greater resistance to water is ideal, where spray application is desired.

TYPE II-BRUSH-ON/SPRAY GRADE Dampproofing is an asphalt-base, clay emulsion with fibers specifically formulated to offer a tight film that combines both excellent strength and resistance to water.

TYPE III-TROWEL-ON-GRADE Dampproofing is a trowel-applied mineral colloid, asphalt emulsion fibrated with selected fibers and produced in an ideal, light trowel application consistency. Type III offers high weather, water, corrosion and abrasion resistance. It can also be used as an adhesive on foam board installations.

All SEALMASTIC products meet the VOC content of 500 g/L for Bituminous Coatings and Mastics as required by U.S. EPA Architectural Coatings Rule.

SEALMASTIC Emulsion Type Dampproofing Coatings are ideal for reducing dampness and moisture infiltration through foundation walls, footings, retaining walls, parapets, fire walls, tanks, culverts, cisterns and bridge abutments. They are also applicable for stone-backing, above-grade cavity wall applications and below-grade masonry wall dampproofing.

Features and Benefits

bulletAdheres to damp or "green" surfaces...no waiting for concrete to thoroughly dry
bulletReady-to-use...no heating or thinning required...dries rapidly
bulletFast and economical way to protect concrete and masonry foundation walls from moisture penetration
bulletEasy-to-apply...available in spray, brush or trowel grades to meet a broad application range
bulletThree application grades available for maximum versatility
bulletVOC compliant...meets the U.S. EPA Architectural Coatings Rule requirements

Application Tools


Electric Drill with Jiffy Mixer

Soft Bristle Brush

Ratio Pump

Wire Brush

Maintain Energy Efficiency
SEALTIGHT Products applied for thermal and moisture protection help prevent moisture or vapor penetration into the other systems of the structure. These products play a key role in maintaining the structure's energy efficiency.

MIXING: For Type I or Type II, stir the contents in the container thoroughly prior to applying with a soft bristle brush or suitable spray equipment. When applying Spray-On Dampproofings, use a Graco 9:1 ratio pump or equal, capable of delivering 3 to 5 gallons per minute (11.36 liters to 18.93 liters), and a Polegun with a 1/8" (3.18mm) to 1/4" (6.35mm) tip. A 3/4" I.D. (19.05mm) material hose and a 1/2" I.D. air hose from the pump to the gun is recommended for most applications. Apply SEALMASTIC Emulsion Dampproofings to clean, dry surfaces at temperatures above 40F (4C). Apply in a continuous, unbroken film, free of pinholes and over any exposed footings, slots or grooves, etc.

NOTE: Fillers, extenders and additives in concrete mixes can produce a higher than normal porosity and as a result, additional coverage coats may be required.

SURFACE PREPARATION: All surfaces to be coated must be thoroughly cleaned of all scale, loose mortar, rust, dirt, oil, grease and other foreign matter. Use a wire brush, sandblast or other methods in keeping with good construction practices. Before product application, fill voids, cracks and holes in concrete with cement mortar and allow to dry. Dusty or porous masonry must be primed with asphalt primer and allowed to dry thoroughly before applying dampproofings.
Do not apply when the temperatures below 35F (2C) are anticipated. Do not apply in rain or when rain is threatening. For added protection against backfilling damage, install SEALTIGHT PROTECTION COURSE after the damproofing has dried. Backfill immediately. SEALMASTIC Damproofings should not be use in areas subjected to prolonged exposure to sunlight.

POROUS SURFACES: (i.e., concrete block)

bulletFor moderate conditions, apply a heavy coating of cement mortar and one coat of Type I, Type II or Type III 1/16" (1.59mm) thick wet film thick. For added protection, apply a second coat 1/16" (1.59mm) wet film thick.
bulletFor severe conditions, or for added protection, wait 24 hours before applying a second coating 1/16" (1.59mm) wet film thick of Type I, Type II or Type III. Within four hours of the last coat, press glass fabric into the mastic, overlapping each piece three to four inches. Allow 48 hours more before backfilling.


bulletFor moderate conditions, generally 1 coat of Type I, Type II or Type III 1/16" (1.59mm) wet film thick is recommended. If Type I is used, two coats are preferable. Allow 12 hours between coats.
bulletFor severe conditions, or for added protection, apply two coats of Type I, Type II or Type III to a total thickness of 1/8" (3.18mm) wet film thick. If desired, glass fabric can be embedded in the first coat. Allow 24 hours before applying the second coat.

5 gallon (18.93 liter) Pails
55 gallon (208.20 liter) Drums

Type I-Spray Grade

Type II-Brush-On or Spray Grade
Type III-Trowel-On Grade
ASTM D 1187, Type I
ASTM D 1227, Type III Class I
ASTM D 1227, Type II Class I
ASTM D 1227, Type II Class I

Type I -Spray Grade

bulletBelow-grade: First coat, approximately 70-80 ft./gal. (1.72 to 1.96m/L).
bulletAbove-grade applications: Approximately 100 ft./gal. (2.45 m/L).
bulletStone-backing: Approximately 125-150 ft./gal. (3.07 to 3.68 m/L).

Type II-Brush-On or Spray Grade

bulletOne-coat, approximately 30-35 ft./gal. (.74 to 86 m/L) 1/16" (1.59mm) thick depending on texture and porosity of the surface.

Type III-Trowel-On Grade

bulletOne-coat, approximately 20-25 ft./gal. (.49 to .61 m/L) 1/16" (1.59mm) thick.

* All coverage rates are based on wet film thickness.

Keep from freezing in the original container.
Refer to Material Safety Data Sheet for complete Health and Safety Information.

This material last updated October 2000.


W. R. MEADOWS, INC. warrants that, at the time and place we make shipment, our materials will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the exclusive remedy for breach of this Warranty, we will replace defective materials, provided, however, that the buyer examine the materials when received and promptly notify us in writing of any defect before the materials are used or incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has shipped the materials, all our Warranty and other duties with respect to the quality of the materials delivered shall conclusively be presumed to have been satisfied, all liability therefore terminates, and no action for breach of any such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event be liable for consequential damages. Unless otherwise agreed to in writing, no warranty is made with respect to materials not manufactured by W. R. MEADOWS, INC. We cannot warranty or in any way guarantee any particular method of use or application of the performance of materials under any particular condition. Neither this Warranty nor our liability may be extended or amended by our salesmen, distributors or representatives, or by our distributor's representatives, or by any sales information or drawings.


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Copyright 2002 O'Brill Company
Last modified: August 09, 2004