845 Penetrant & Prime Coat

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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 # 845

100% Epoxy Penetrant & Prime Coat



Epoxy.com Product  #845 Epoxy Penetrant & Prime Coat is a 100 % solids, low viscosity, epoxy primer for use on steel, concrete or wood. The low viscosity and special adhesion promoters make it an excellent penetrant of rusted steel or concrete. Epoxy.com Product #845 acts as an inert barrier, resistant to impact, acids, caustics, solvent and thermal shock. The tough water proof surface is excellent for subsequent coatings.



  • Penetrates and reinforces rusted steel surfaces.
  • Cures under high humidity.
  • Solvent free; 0.0 lbs. VOC.
  • Good abrasion, heat and impact resistance.
  • No blush or exudation.


Finish Semi-Gloss

Color Clear

Pot Life 3 hours @ 75° F (24° C)

Mixing Ratio 2 parts "A" to 1 part "B" By volume

Tack Free 8 hours @ 72° F (22.2° C)

Full Cure 7 days @ 72° F (22.2° C)

Recommended Film Thickness 1 coat @ 1.0-1.5 mils

Coverage Rate 1600 sq. ft./gal. @ 1.0 mils (148 meter2/gal.)

Flash Point 200° F (93° C)

Shear Bond Strength (ASTM D1002)

Tensile (Steel to Steel): 2,200 psi

Hardness (Shore D) (ASTM D1706-61) 65

Pull Off ASTM

      Steel: 500 psi (MPa - 3.45)

      Concrete: 790 psi (MPa - 5.45)

Operating Temperature

      Wet: 250° F (120° C)

      Dry: 300° F (149° C)


Epoxy.com Product #845 Epoxy Penetrant & Prime Coat is designed for less than ideal surface preparations.

However, performance will be improved as surface preparation improves. All oil/grease, contaminants, loose rust, loose scale and unsecured old paint must be removed. Remove all contaminants by means of low/high pressure water blasting. Concrete surfaces new or free from contaminants should be brush blasted to remove surface laitance.


Combine (2) two parts "A" to (1) one part "B" by volume in the quantity desired and mix with a low speed drill for 3-5 minutes. Scrape sides and bottom to ensure thorough mixing. Do not thin the Epoxy.com Product #845.

Epoxy.com Product  #845 is a two component product supplied in 3 gallon and 15 gallon kits. The pot life of the mixed material is 3 hours at 77° F (25° C) . Higher temperatures will reduce working life of the coating; lower temperatures will increase it.



Epoxy.com Product #845 Epoxy Penetrant & Prime Coat can be applied by conventional air spray, brush or roller. Epoxy.com is designed to be applied in one coat at 1.0 to 1.5 mils .

A Graco #700 or #800 air spray gun with suitable needle/nozzle and air cap combinations will work best. To minimize over spray, use low air pressure and pot pressure, 5 to 10 psi (0.3 to 0.7 bars) Airless pump application is not recommended.

Epoxy.com Product  #845 is low in viscosity. It should be applied in one thin, wet coat sufficient to completely cover and penetrate to the steel surface. Do not apply heavy coats. Clean up application equipment with appropriate solvent MEK xylene Acetone.

Apply one coat of Epoxy.com Product #845 at 1.0 to 1.5 mils - allow overnight cure. An additional coat of may be required for very porous surfaces. After overnight cure, Epoxy.com Product #845 may be coated if still tacky. Epoxy.com Product #845 may be top coated with a wide range of top coating systems.

SHELF LIFE: 2 years


"A" Component contains epoxy resin. DANGER! "B" Component contains alkaline amines; strong sensitizer. May cause skin sensitization or other allergic responses. Use with good ventilation, particularly if material is heated or sprayed. Prevent all contact with skin or eyes. Wear protective clothing, goggles, gloves and/or barrier creams. Keep container closed when not in use. Wash thoroughly after handling.

FIRST AID: In case of skin contact, immediately wash with soap and water. in case of eye contact, flush eyes with copious amounts of water for at least fifteen (15) minutes. Remove contaminated clothing shoes. If irritation persists, seek medical attention. Wash clothing before reuse.





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 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

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

MasterCard, Visa, and American Express logo

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.


[Home] [Catalog of Products] [Where to Start] [[Bonding Systems] [Chip Floors] [Chemical Resistance]
[Coatings] [Conductive] [Applications] [Elastomeric Systems] [High Temperature]
[Industrial Floors] [Injection] [Joint Systems & Sealants] [Mortars / Grouts] [Novolac] [Polymer Systems]
[Primers and Sealers] [Misc.] [Seamless Flooring] [Waterproofing] [Dealers Wanted] [Installation Tips]
[Product Guide] [Wood Filler] [Who We Are] [Guide Specs]
[Tech Data Sheets in Acrobat Format ] [MSDS in Acrobat Format] [Online Ordering Authorization Form]

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