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

Epoxy.com Product #870

(Replaces Epoxy.com Product #850)

Epoxy Penetrating Sealer


Epoxy.com Product #870 Epoxy Sealer is a two-component penetrating epoxy sealer (with very high solids) designed for superior protection of new concrete or for prolonging the serviceability of partially-deteriorated concrete. The sealer is a low to medium viscosity material and is capable of providing an effective membrane barrier to inhibit moisture migration and corrosive chemical penetration.

In the cured state Epoxy.com Product #870 allows moisture vapor transmission; it seals off moisture entry but still allows the concrete to breath. When applied to concrete placed and finished in accordance with standards defined in ACI 201 (Guide to Durable Concrete), Product #870 greatly improves wear resistance of the concrete surface, slows down the corrosion of reinforcing steel and adds many years' life to the structure. Product #870 has a solids content of 50% after curing. It may be applied to dry surfaces at temperatures of 40°F (0°C) or above.


  • Parking garage decks, and ramps
  • Shop and warehouse floors
  • Floors where food processing occurs
  • Columns and beams
  • Whenever new or old concrete must be protected from the effects of chloride ion penetration, free water, water-born contaminants, freezing and thawing, petroleum products, and abrasion.


Mix Ratio 50:50 by Volume
Color Clear/Amber (mixed)
Mixed Viscosity (@77 Degrees F) 250-350 CPS (mixed)
Gel Time 1.5-3 hour (after application)
Shelf Life: (@85 Degrees F Maximum Temp) 1 Year (minimum)
Pot Life 1.5-3 hours
Final Cure 7 days



Surface life of the sealer is primarily dependent upon good surface preparation. Sealer life will be extended by following these recommendations: Epoxy.com Product #870 on a warehouse floor

1. The concrete must be cleaned free of old existing coatings, oils, grease, dirt, and wax solutions.

2. Sandblast or water-blast surface to remove contamination, heavy laitance, sharp edges or protrusions, if there are any which could interfere with the uniform application of the sealer. Use of acids is not recommended.

3. Weld structural cracks with Epoxy.com Product #684; seal movable cracks with Epoxy.com™ Product #11 Control Joint Filler. Remove unsound existing patches and fill chuck holes and deteriorated areas with Epoxy.comâ„¢ 10 Mortar or Product #25 Mortar Kit.

4. Remove all debris from working surfaces.

5. Allow all Epoxy.com™ products used in repair to fully cure before application of Penetrate Sealer.


Supplied as two-package system. Open Component "A" and agitate resin until evenly blended. Open Component "B" and pour entire contents into Component "B" into Component "A". Agitate the combined mixture with low speed power mixer (200-300 rpm) until one even color develops (2-3 minutes).


Penetrate Sealer may be applied with roller, brush or airless spray. Ensure that the concrete surface is dry, moisture will interfere with product penetration. Two coats are required for most applications. Apply #870 evenly over area according to coverage requirements. Concrete surfaces will accept the sealer at different rates because of porosity, moisture content and other variations and this may result in discoloration or darkening of the finished surfaces.

Typically, One-coat application of penetrant sealer averages about 100 sq. ft. per gallon, per coat; however coverage per coat will vary with porosity, texture and surface and other variations. It is necessary to permit material to become tack-free before the section is open to use. Normally, sufficient evaporation occurs within 3-4 hours after application, at 75°F (23.8°C)

For skid resistance broadcast clean, dry sand at a rate of 1-2 lb. per square yard.


Prolonged or repeated exposure may cause eye and skin irritation. Avoid contact with skin or eyes. If contact occurs, wash immediately with soap and water. Flush eyes immediately with water and contact physician. If used indoors, provide adequate ventilation. Use safety glasses, and wear protective rubber or polyethylene gloves. Epoxy.com™ #870 contains flammable solvents, so extra precautions should be taken in confined areas. Never allow open flame or sparks in area when #870 is being applied. Adequate ventilation must be provided when applying.


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 on Epoxy.com Products please contact:

A Division of Epoxy Systems, Inc
20774 W. Pennsylvania Ave.
Dunnellon, Florida 34431
Over 300 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

 352-533-2167  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

Website:  www.epoxy.com

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

We accept MasterCard, Visa, American Express, Discover, Wire Transfers, and Cashiers Checks We accept MasterCard, Visa, American Express, Discover, or Wire Transfers.

Copyright © 1994-2014 (providing online information about the right product for the right job for 20 years) 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.  (hereinafter known as "Supplier" warrants its products (when properly stored) for the period of time as follows: Epoxy one (1) year; Polyesters, Methyl Methacrylate  and Polyurethanes Six (6) months.  Supplier 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 Supplier. If any product fails to meet this warranty, the liability of Supplier will be limited to replacement of any non-conforming material if notice of such non-conformity is given to Supplier within the warranty period for the material (as indicated above), or within 1 year of the delivery of materials (whichever is sooner). Supplier may in its discretion refund the price received by Supplier in lieu of replacing the material. No customer, distributor, or representative of Supplier 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 Supplier. In order to obtain replacement or refund the customer must provide written notice containing full details of the non-conformity. Supplier 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. SUPPLIER'S OBLIGATION SHALL NOT EXTEND BEYOND THE OBLIGATIONS EXPRESSLY UNDERTAKEN ABOVE AND SUPPLIER 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 us 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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