Applying New Epoxy over Old Epoxy

February 13, 2015

I frequently get calls and emails from folks who want to install our epoxy over an existing epoxy floor or coating that they have. They want to know if it is okay to go over it and what they have to do to properly prepare the surface.

If the existing epoxy is a good hard solid one that is well bonded to a well prepared substrate it is possible. On the other hand if you are replacing it, what is wrong with the existing epoxy? Has the existing epoxy been badly abused by heavy sharp objects being dragged on it? Was the exiting epoxy damaged by chemicals beyond the chemical resistance of the existing epoxy? Are you just trying to upgrade the look of the existing epoxy?

You should be concerned about going over epoxy that is coming loose from the substrate. That may mean that there was poor surface preparation. It may also mean that the quality of the epoxy might not be what it should be. You need to be concerned about epoxy that is wearing out. If it is wearing out you want to know why. My company and I personally started out as installers of epoxy. I have never seen or been made aware of any of coatings and/or flooring systems that have worn out have come loose from the concrete. I have seen concrete so pounded by traffic that it came loose, but our epoxy was still attached and still doing its job. That is based on over 30 years of field experience with the products.

Back to the question, “can I put epoxy over epoxy?” I always assume that the reason that the epoxy is wearing out or coming loose is that the epoxy is low quality or the installation was poorly done or both until I can prove otherwise. The way that I do that is to attempt to grind or shot blast off the existing epoxy. If after a substantial effort the epoxy cannot be removed and I cannot hear a hollow sound under the existing epoxy, I feel I have proven that the existing material is solid and well bonded.

Let’s take a moment to discuss that dreaded hollow sound above. If the flooring system or coating is very poorly bonded you will get a sound from your grinder like you are dragging a piece of paper or a piece of stone under the grinder, or rubbing stone. When you tap it with a hammer you get a hollow higher pitch noise than you get when you tap solid concrete or a solid floor over concrete.

You must be sure that the substrate is free of all types of contamination, including but not limited to oil, grease, food fats, curing compounds, sealers, laitance, dirt, wax etc. The existing epoxy left behind must be well bonded, and sanded until it has no shine. See Epoxy Surface Preparation Procedures for more information on this subject.

The beauty of trying to get it off is you are removing all the shine and getting it ready to accept another layer of epoxy. Just before I install the new layer of epoxy I solvent wipe with xylene, let it dry. Then I recommend a coat either Product #899 Primer or Product #12 Chemical Resistant Primer. Then install epoxy as usual. For more surface preparation and installation tips please visit or “Where to Start” page at:

Related Resources on Epoxy

Where to Start” page may be the best way to get you off to a quick start.

Epoxy Coatings

Epoxy Primers and Sealers

Chemical Resistant Epoxy

Epoxy Chemical Resistance Chart Technical Support
Norm Lambert, President – Technical Support Director




New Electro Static Dissipative Epoxy

September 1, 2010 announces a new ESD Epoxy Product

New Epoxy Electrostic Dissipative (ESD) Epoxy Coating

Less Expensive, Easier to Use, More Durable Product #677

Electro Static Dissipative (ESD) /CONDUCTIVE COATING

DESCRIPTION Product #677 is a pigmented, water-based epoxy coating designed to achieve either an electro-static dissipative (ESD) finish or conductive finish by
modifying the underlying system components and thickness. Product #677 has very low odor making it suitable for use in occupied
buildings and has high bond strength and adhesion to concrete and other surfaces.


  • Durable, Attractive, Chemical Resistant, Non-Porous, Light Reflective Finish.
  • Low Odor during application and cure.
  • Maintains Electrical Conductivity Performance over the Wear Life of the System
  • Fast Dry and Re-coat Time.
  • Easy Clean-up.
  • Provides an ESD finish in the range of 1,000,000 to 1,000,000,000 ohms resistance when used over a non-conductive
    primer/basecoat or a conductive finish in the range of 25,000 to 1,000,000 ohms resistance when used over a conductive primer/basecoat.


  • Substrate must be above 50°F and relative humidity below 85% for proper curing.
  • Substrate must be free of dirt, waxes, curing agents and other foreign materials.
  • Excessive moisture in the substrate will require a moisture vapor control treatment.


Concrete floors and walls in electronic component assembly areas, data processing, military/aerospace, pharmaceutical plants,
hazardous industries (dust or explosion hazards). For use in any areas where the build-up of static electricity is a concern or a spark-proof floor is required.



Surface Preparation is the most critical portion of any successful resinous flooring system application. All
substrates must be properly prepared and tested for moisture as outlined in
Surface Preparation Guidelines.


Mix Part B of Product #677 prior to combining. Mix 1 part Part A with 2 parts Part B. Product #677 at a rate of 200 ft2
per gallon per coat with a short nap roller. Care should be taken to avoid
puddles. Two coats are necessary to insure uniform coverage. Product #677 Thin-Film ESD Epoxy Coating System 12-15 Mils(1,000,000-1,000,000,000 ohms)

Material Qty./ 1000 SF Coverage
1. Product #899 Epoxy Primer 4-5 gallons 200-250 SF /gallon
2. Product #677 ESD/Conductive Epoxy Coating 5 gallons 200 SF /gallon
3. Product #677 ESD/Conductive Epoxy Coating 5 gallons 200 SF /gallon


Clean skin with soap and water. Tools and equipment should be cleaned with warm soapy water, xylene or lacquer thinner. Consult Material Safety Data for safety and health precautions.


Waterborne Epoxy Resin and Conductive Fillers

COVERAGE Product #677, when applied at 200 SF per gallon, yields 5.2 �to 6.0 mils dry film thickness.


Viscosity @ 75°F 600-1000 CPS
Mixing Ratio 1 Part A to 2 Parts B by Volume
Solids Content, by volume 50-55%
Volatile Organic Content (VOC) <20 gm/L
Bond Strength to Concrete 400-500 psi (100% concretefailure
Weight per Gallon, mixed 8.75-9.00 pounds per gallon, mixed


Pot Life 20-30 min.
Dry to touch 6 hours @ 75°F
Recoat 8-24 hours @ 75°F
Light Traffic 24 hours @ 75°F
�H� Hardness 2 days
�5-H� Hardness 30 days


Contact Customer Service Department at 321-206-1833


Remove animal fats, oil, grease or soap film promptly to reduce slipperiness. Product #677 can be cleaned with neutral soaps and detergents.
If long periods of heavy traffic cause wear patterns reapply as need.
Anti-skid materials will reduce the effectiveness of the static dissipative
properties of this material.  Do not use aggressive anti-skids. It is
impossible to get an accurate reading of the conductivity of the floor if
anti-skids are used.

Technical Services

Contact Technical Support with your questions about this
product at 352-533-2167. Technical Support Department can help you
with the selection, specification, installation, and maintenance of products, or visit

Norm Lambert
President &
Director of Technical Support
Epoxy Systems, Inc
Available by Phone M-F 9AM-4PM Eastern Time (6 AM – 1 PM Pacific Time)
352-533-2167 (Voice)
352-465-3497 (fax)

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[MSDS in Acrobat Format] Announces New Conductive Novolac Chemical Resistant Epoxy Flooring System

April 9, 2010 a division of Epoxy Systems, Inc. announces that it has added Product #676 Novolac Epoxy Chemical Resistant Conductive Floor Coating to the line of Conductive Resins. Product #676 is a 100% solids – Zero (0) VOC epoxy Novolac Chemical resistant conductive (anti-sparking) epoxy flooring and floor coating system ideal for severe chemical and solvent storage requiring a chemically resistant conductive and spark resistant surface.

 Applied at a nominal 1/16”, Product #676 Novolac Epoxy Chemical Resistant Conductive Floor Coating offers the superior chemical resistance of an  Novolac Epoxy Resin System while maintaining a conductive surface.


  • Low viscosity for improved handling during application.
  • Exhibits excellent resistance to strong acids, alkalis and most industrial chemicals and solvents.
  • 100% Solids—low odor application and cure (0-VOC).
  • Bonds well to cool, damp substrates.
  •  Conductive & non sparking, 25,000 to 1,000,000 ohms resistance.


  • Substrate  to receive Product #676 Novolac Epoxy Chemical Resistant Conductive Floor Coating temperature must be a minimum of 50°F.
  • Substrate must be free of dirt, waxes, curing agents and other foreign materials.
  • Steel surfaces to receive Product #676 Novolac Epoxy Chemical Resistant Conductive Floor Coating must be free of grease and oils.  Abrasive blast to SSPC-SP-3.
  • Refer to Surface Preparation Guidelines for  substrate requirements.


100% Solids, modified polyamine, cured epoxy novolac resin and fillers



Surface Preparation is the most critical portion of any successful resinous flooring system application.  All substrates must be properly prepared as outlined in Surface Preparation Guidelines.  Contact  technical service department is pleased to answer any questions.


Installation of Product #676 Novolac Novolac Epoxy Chemical Resistant Conductive Floor Coating will vary with application.  Normally spread with a trowel or squeegee and lightly back-rolled with a medium or short nap roller.  Care should be taken to minimize the entrapment of air caused by over rolling. For complete instructions, consult installation guide or Technical Support Department


Clean skin with soap and water.  Tools and equipment should be cleaned with xylene or lacquer thinner.

COVERAGE Product #676 Novolac Epoxy Chemical Resistant Conductive Floor Coating will yield approximately 32 mils when spread at 50 ft2 per gallon.  Two coats required.

COLOR Product #676 Novolac Epoxy Chemical Resistant Conductive Floor Coating is available in Standard Colors and Custom Colors as approved.


Viscosity @ 75°F 1,000-1,500 cps
Mixing Ratio by volume 2 Part A to 1 Part B by Volume
Solids Content by volume     100% by volume
Volatile Organic Content 0
Weight per gallon, mixed 11.0-11.5 lbs. per gallon mixed


Pot Life 20-25 min. @75°F
Dry to Touch 6-7 hours @ 75°F
Re-Coat 8-12 hours @ 75°F
Light Service 24 hours @ 75°F
Full Cure & Maximum Resistance     5 days




Acetic Acid-10%, 30% R
Acetone L
Ammonia Hydroxide-38% R
Beer R
Bleach L
Brake Fluid R
Citric Acid-30% R
Citric Acid-40% R
Crude Oil R
Diesel Fuel R
Ethylene Glycol R
Fatty Acids R
Gasoline R
Hydrochloric Acid-37% R
Lactic Acid-50% R
Lactic Acid-80% R
Methyl Ethyl Ketone R
Methylene Chloride L
Nitric Acid-10% R
Peroxide-35% R
Phosphoric Acid R
Skydrol R
Sodium Hydroxide-50% R
Sulfuric Acid-98% R
Toluene R
Urea R
Vinegar R
Xylene R
R-Recommended for continuous service
L-Limited Recommendation, occasional spills
*-May cause slight stain or discoloration


After completing the application of Product #676 Novolac Epoxy Chemical Resistant Conductive Floor Coating, the installer should provide the owner with maintenance instructions. Product #676 Conductive Chemically Resistant Novolac Floor Coating is easily cleaned with neutral soaps or detergents.

For more information please contact Technical Support at: 352-533-2167 or email them at

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