Epoxy.com Product #844

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Epoxy.com Logo - Epoxy, Polyurethane, Polysulfide, Polyester, MMA - Methyl Methacrylate and other Construction Resin Systems - Over 350 Products- Since 1980

Epoxy.com Product #844

Concrete Membrane Deck Primer


Product #844 Concrete Membrane Deck Primer is a 100% solids, two (2) component polyurethane primer. This thin film primer promotes long term wear and superior adhesion of the Product #409 Resilient Traffic Bearing Membrane. The Product #844 penetrates and seals the surface to allow for a smoother, pinhole free application.


Product #844 is used only on concrete. May be applied to properly prepared interior and exterior concrete to enhance the bond and performance of the Product #409  System.


  • 100% Solids
  • Zero VOC
  • Ease of application
  • Eliminates blisters and pinholes
  • Fast cure, ready to accept overcoat in 2 hours
  • 1:1 Mix Ratio


Pedestrian Grade and Traffic Grade - For pedestrian grade or traffic grade application apply one coat of Product #844 at 3.0 to 4.0 mils WFT to achieve 3.0 to 4.0 mils DFT. It is recommended that while wet, the Product #844 be lightly seeded with a rounded 16 / 30 silica sand.

Please refer to Product #409  Resilient Traffic Bearing Membrane Product data sheet for the complete system description for over coating the Product #844.






Volume Solids


Dry Time:

Dry to touch

1 hr @ 70°F

Dry to recoat

2 hrs @ 70°F

Maximum recoat interval of Product #844 when over coated with Product #409  shall not exceed 36 hours. If maximum over coat is exceeded reapply Product #844 over a clean dry surface.

Shore D Hardness


Tensile Strength

1600 psi



MVT, perms at 30 mils dry



Concrete - All concrete must be cured a minimum of 28 days. All concrete must be clean, sound, dry, free of oils and other bond inhibiting contaminants. Air and substrate temperature shall be 40°F and rising. Mechanical surface preparation such as shot blasting, abrasive blasting or hydroblasting is required to produce a clean and lightly profiled or textured surface. If hydroblasting is used, allow 24 to 48 hours for concrete to dry thoroughly.


Combine one (1) part component "A" and one (l) part component "B" by volume, in the quantity desired. Mix Product #844 with a mixing paddle and low speed drill for two (2) minutes. Avoid entrapping air while mixing. Apply immediately after mixing.


Apply by brush, roller, or airless sprayer at 3.0 to 4.0 mils WFT to achieve 3.0 to 4.0 mils DFT. While Product #844 is still wet, lightly seed with a rounded 16 / 30 silica sand. Allow to dry a minimum two (2) to four (4) hours at 70°F or until tack free prior to application of Product #409  Intermediate coat.


Minimum application temperature of 40°F and rising. Do not apply over damp or wet concrete. Do not apply to surfaces with active moisture vapor transmission. Product #409  Intermediate must be applied within 36 hours after application of Product #844 Primer.


Product #844 is packaged as a 2 gallon and 10 gallon unit.


Product #844 shall be stored in a dry, protected area at temperatures between 60°F and 90°F. Do not allow to freeze.


Product #844 contains organic isocyanates MDI. Avoid breathing vapors. Avoid contact with skin and eyes. Do not ingest. Keep away from foodstuffs and wash thoroughly before smoking or eating. Should skin contact occur, wash skin well with soap and water. Should eye contact occur, flush thoroughly for at least 15 minutes with water. Get medical attention.


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Proper mixing and installation is critical to the optimal success of all product.  See Installation Tips, Techdata, & MSDS for more details on our products.  Be sure to contact us with any questions and/or concerns that you have.

For more information please contact:

A Division of Epoxy Systems, Inc
20774 W. Pennsylvania Ave.
Dunnellon, Florida 34431
Over 350 products,
Since 1980
Florida & Vermont

Office Hours: 9AM-4PM Eastern Time (6AM-1PM Pacific Time).
Closed 12Noon-1PM Eastern Time for Lunch

321-206-1833   Customer Service - Ordering and Order Status
                          Katey Fontaine, VP - Customer Service Director

714-657-3826  Technical Support
                         Norm Lambert, President - Technical Support Director 

352-489-1666   Accounting and Administration
                         Debby Lambert, CEO, and CFO

352-489-1625   Fax line to all Departments

24 hour Hazmat Emergency Telephone Response Service -1-800-633-8253

We accept Mastercard, Visa and American express

Copyright © 1994-2009 EPOXY.COM a division of Epoxy Systems, Inc. - Florida and Vermont.  All rights reserved.

Unless other wise agreed upon in writing, buyer is responsible for the cost of shipping.

This information is presented in good faith to assist in determining whether this product is suitable for application. No warranty or representation, however, is intended or made, nor is protection from any law or patent to be inferred, and all patent rights reserved.

Epoxy.com a division of Epoxy Systems, Inc.  warrants its products (when properly stored) for the period of time as follows: Epoxies, Product #315, Product #315BC, and Product #316 one (1) year; Polyesters, Methyl Methacrylates (normal) two (2) months and Polyurethanes Four (4) months;  Power Tools and Equipment 90 days; Vinyl Esters, High Molecular Weight  Methacrylates (HMMA) and all other resins (not specifically mentioned above) 30 days; hand tools (non-power tools) 30 days.   Epoxy.com warrants that its products will be free of manufacturing defects and will be in conformity with published specifications when handled, stored, mixed and applied in accordance with recommendations of Epoxy.com. If any product fails to meet this warranty, the liability of Epoxy.com will be limited to replacement of any non-conforming material if notice of such non-conformity is given to Epoxy.com within the warranty period for the material (as indicated above), or within 1 year of the delivery of materials (whichever is sooner). Epoxy.com may in its discretion refund the price received by Epoxy.com in lieu of replacing the material. No customer, distributor, or representative of Epoxy.com is authorized to change or modify the published specifications of this warranty in any way. No one is authorized to make oral warranties on behalf of Epoxy.com. In order to obtain replacement or refund the customer must provide written notice containing full details of the non-conformity. Epoxy.com reserves the right to inspect the non-conforming material prior to replacement. EXCEPT FOR THE EXPRESSED WARRANTY STATED ABOVE, THERE ARE NO OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR PURPOSE. Epoxy.com 'S OBLIGATION SHALL NOT EXTEND BEYOND THE OBLIGATIONS EXPRESSLY UNDERTAKEN ABOVE AND Epoxy.com  SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO THE PURCHASER OR ANY THIRD PARTY FOR ANY LOSS, COST, EXPENSE, DAMAGE OR LIABILITY, WHETHER DIRECT OR INDIRECT, OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. All quotes and sales subject to availability.

Many of our products are made on an individual order basis.   Unless authorized in writing by Epoxy.com a division of Epoxy Systems, Inc. in writing before the material is made, there are no returns on items purchased from us, once the order has been processed, and the material made. In the event of authorized returns a restocking charge will be charged in the amount of 30% of the value of the material returned or $150 whichever is greater.  No returns on non-list priced items.  All Returns are for merchandise (store) credit only, no cash or credit card credits.  In the event of a return, buyer is responsible for the cost of shipping and handling in both directions.

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