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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NO. 356



SEALTIGHT EVAPRE Evaporation Retardant is an economical, high-quality, water-base compound. It is specifically designed to form a thin monomolecular film to reduce rapid moisture loss from the concrete surfaces prior to curing. EVAPRE provides a significant aid in producing high-quality concrete flatwork. Rapid evaporation of water is retarded, slab surface conditions are normalized, and workers can adhere more closely to established finishing schedules. EVAPRE is VOC-compliant.

EVAPRE significantly reduces plastic shrinkage and cracking, wind crusting, stickiness, and sponginess which often cause poor and uneven surface texture. These conditions result when the hydration is more rapid than the movement of bleed water to the surface. EVAPRE effectively combats and minimizes the effects of rapid drying conditions such as low humidity, low dew point, high winds, direct sunlight, hot weather, heated concrete or placement of concrete in a heated enclosure or interior area during cold weather. The protective film shield disappears as soon as the concrete is no longer plastic.

SEALTIGHT EVAPRE is ideal for use as an evaporation retardant for concrete surfaces where the evaporation rate exceeds the rate of bleeding. EVAPRE can be used with condensed silica fume concrete, concrete containing fly ash and all cementitious products. When applying surface hardeners, EVAPRE can be used after screeding and after the first floating operation if necessary.


bulletSignificantly reduces plastic shrinkage and cracking caused by evaporation in low humidity, high temperature and high winds
bulletAllows use of lower slump & lower water : cement ratio
bulletProvides smooth and durable concrete flatwork
bulletReduces wind crusting, stickiness, and sponginess which often cause poor and uneven surface texture
bulletAllows finishing crews to adhere to established schedules
bulletReduces overall cost because timing of finishing operations is less critical
bulletHelps minimize surface cracking due to early water loss of silica fume concrete
bulletAvailable in exclusive, easy-to-use, 45-ounce container.

55 Gallon (208 liter) Drums
5 Gallon (18.9 liter) Pails
1 Gallon (3.8 liter) Units
45 Ounce (1,596.9 cu. cm) Container

One gallon (3.8 liters) of EVAPRE mixed with 9 gallons (34.2 liters) of water will cover 2,000 - 4,000 ft. (50 - 100 m/L). Quantity needed will increase if additional coats are required.
45 ounce (1,596.9 cu. cm) container: pour into a 3-1/2 gallon sprayer, add water and ready-to-use.

SEALTIGHT EVAPRE is specifically designed to fight off the destructive effects of early rapid evaporative moisture loss. Early rapid evaporative moisture loss is addressed in ACI Committee 305R-91, entitled "Recommended Practice for Hot Weather Concreting". This report contains a chart on Page 5 which depicts the effect of concrete and air temperatures, relative humidity and wind velocity on the rate of evaporation of surface moisture from concrete. It provides a graphic method for estimating the loss of surface moisture for various weather conditions.

STEP 1 - For the majority of applications, EVAPRE should be mixed at a ratio of one (1) part EVAPRE to nine (9) parts of water. Agitate EVAPRE before mixing with water. Agitate the diluted solution, again, before applying. NOTE: EVAPRE is available in easy-to-use, exclusive 45-ounce container. Just pour into 3-1/2 gallon sprayer, add water to fill and go to work.

STEP 2 - Apply EVAPRE with a commercial sprayer. Use a Chapin 8005 spray tip that produces a flow rate of 1/2 of a gallon per minute.

STEP 3 - The EVAPRE diluted solution should be applied immediately after screeding and/or between finishing operations, as needed. Application is simplified by the fugitive pigment, which will disappear completely upon drying. Do not allow to puddle.

STEP 4 - Clean all equipment immediately after use with soap and water.

STEP 5 - Finish concrete surface as required.

STEP 6 - Cure concrete with SEALTIGHT Curing or SEALTIGHT Curing and Sealing Compound after bleed water or excess surface water has dissipated. The use of EVAPRE does not negate the need for a quality concrete curing compound.

The residue remaining on the surface, after finishing will not impair bonding or alter color. The protective shield usually lasts as long as the concrete is plastic. Therefore, all concrete surfaces must be properly cured, as well.

DO NOT USE EVAPRE as a finishing aid to facilitate easier finishing of cementitious materials, such as dry shake surface hardeners or toppings. EVAPRE should not be worked into the concrete surface nor should it be used to re-temper the concrete.

W. R. MEADOWS, INC. is not responsible for compatibility or results, when EVAPRE is used with other manufacturer's products.

Read and follow application information and use in accordance with the Health and Safety information shown on the container label. Refer to Material Safety Data Sheets for complete health and safety information.


This material last updated September, 2001.

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