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High Chemical Resistance Epoxy Coating

Epoxy.com Product #633W


Epoxy.com Product #633W is a 100% solids epoxy novolac coating ideal for harsh chemical and solvent environments. “W” designates High Viscosity formulation for improved film build on vertical surfaces. Epoxy #633W can be used as a seal coat for various Epoxy.com products and systems where extreme chemical resistant performance is required, such as secondary containment, solvent storage, pump pads, trenches, chemical process areas, and other high exposure areas.

Epoxy Novolac Wall Coating is 100% solids, modified amine adduct cured epoxy novolac (novolac epoxy) resin.


  • Exhibits excellent resistance to strong acids, alkalis, and most industrial chemicals and solvents.
  • Can be applied in occupied facilities.
  • Can be applied in cool damp conditions.
  • Can be rapidly re-coated in ambient conditions.


Good surface preparation is one of the most important parts of the installation of a high end coating. Be sure to follow our Surface Preparation Guide before installing this product.


  1. Review and follow epoxy installation tips
  2. Properly prepare the substrate.
  3. Mix small batches of the material with 2 parts "A" and one part "B", being sure to completely mix for 3 min. Mix only what you can use in half the pot life. Remember the bigger the batch the faster it will setup in your bucket
  4. Installation methods will vary from job to job. Typical application is by brush and quality roller.
  5. Contact Epoxy.com Technical Support with any questions that you have.

Physical Properties

Color See Color Chart
Gloss, 60°F100
Solids Contentr        100%
Mix Ratio2A to 1B by Volume
Pot Life20 min @ 75°F

Dry Time

Foot Traffic @ 75°F10-12 hours
Recoat #75°:F4 hours minimum, 16 hours maximum
Exposures to Chemicals @ 75°F         5 days

Chemical Resistance



Acetic Acid 30%R     
Methylene ChlorideL
Crude OilR
Diesel FuelR
Ethylene GlycolR
Fatty AcidsR
Metyl Ethyl Ketone  L
Hydrochloric Acid- 36%R
Citric AcidR
Sodium Hydroxide - 50%     R
Sulfuric Acid - 98%R
Lactic AcidR
Nitric Acid 20%R
R = Recommended for Intermittent Immersion
L = Limited recommendation, occasional spills

Performance Properties

Tensile Strength ASTM-D-63810,400 psi
Adhesion to concrete ACI Committee 403300-440+ psi (100% concrete failure)
Hardness ASTM-D-224086 Shore D
Abrasion Resistance ASTM-C-501 (CS-17 Wheel)       30 mg loss
Service Temperature MIL-D-3134F180°F - 325°:F (Dry Heat)

Proper mixing and installation is critical to the optimal success of all products.  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
A Vermont Corporation

We have products that have passed the test of time as well as the best new Systems available today.

Since 1980 - 40 years of the highest quality products

Hours: 9AM-4PM Eastern Time (6AM-1PM Pacific Time)

Closed for lunch from 12Noon to 1PM

321-206-1833  Customer Service - Ordering and Order Status
                         Katey Lambert-Fontaine, VP - Chief Operations Officer

                        Technical Support
352-533-2167  Norm Lambert, President - Technical Support Director 

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

352-489-1625   Fax line to all Departments

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