PES-Chem 501 CRSG – Chemical & Corrosion Resistant Coating

PES-CHEM 501 CRSG is a high build solvent-free epoxy coating designed for the long-term protection of steel and concrete structures against corrosion and chemical attack.


  • Apply to mechanical, hydro-blasted or abrasive blasted cleaned surfaces
  • Cures at temperatures as low as 41°F
  • Apply to metallic surfaces suffering from condensation/dampness
  • Ideal for protection against corrosion and low concentration chemical immersion

Typical Applications

Cold water lines Pipework Internal & external tank surfaces
Structural steel Sheet/bearing piles Chemical intake areas
Process equipment Sumps Chemical containment and bund areas

PES-CHEM 501 CRSG is an excellent product for concrete floors & metal drain pans in Air Handling Rooms. PES-CHEM 501 CRSG will fight corrosion in this wet, cool environment, and withstand all chemicals used to control bacteria. The high flexibility properties of PES-CHEM 501 CRSG make it a good choice to seal cracks in concrete flooring by protecting against migration of moisture, which can help prevent corrosion on rebar and the degradation of the concrete flooring itself.

Surface Preparation

Metallic Substrates –  Abrasive blast cleaning

  1. All oil and grease must be removed from the surface using an appropriate cleaner such as MEK.
  2. All surfaces must be abrasive blasted to SSPC/ NACE 2 (ISO 8501/4 Standard SA2.5) minimum blast profile of 3 mils using an angular abrasive.
  3. Once blast cleaned, the surface must be degreased and cleaned using MEK or similar type material.
  4. All surfaces must be coated before gingering or oxidation occurs.

PLEASE NOTE: For salt contaminated surfaces the substrate must be pressure washed with clean water and checked for salt contamination, please refer to the surface preparation and pre-application guide for further information.

PES-CHEM 501 CRSG is used to protect metal cooling tower parts from corrosion, such as the cold and hot water basins, casing walls, and all other wetted parts. With its high adhesion qualities to properly cleaned metal along with high flexural strengths, PES-CHEM 501 CRSG will protect your assets for many years to come.

Existing Concrete

  1. If the concrete surface is contaminated, pressure wash using clean water.
  2. Once the concrete is dry, lightly abrasive blast or scarify taking care not to expose the aggregate.
  3. Clean all dust and debris from the surface and prime with PES-CHEM 503 SPEP (low viscosity epoxy primer).
  4. Apply  PES-CHEM 503 SPEP at 6mils WFT, leave to cure for 3 hours (68°F) before overcoating.

PES-CHEM 501 CRSG a great product to protect key assets like Concrete Cooling Towers, at the same time protecting the environment by preventing chemicals from entering the ground water.


Brush or roller applications:

  1. Pour the mixed material into a paint kettle or paint tray (this will maximize the usable life).
  2. Using a 2″ wide synthetic brush, stripe coat all edges, joints, corners and equipment with the mixed material. The stripe coat must be approximately 4″ wide, at 10mils wet film thickness.
  3. Once the stripe coat has cured sufficiently and is capable of being overcoated, apply the 1st coat of mixed product to all surfaces at 10mils wet film thickness.
  4. Once the 1st coat of material has cured sufficiently, approximately 4 hours at 68°F, apply a 2nd coat of material to all surfaces at 10mils wet film thickness.

Coverage Rates

0.8 gal (3.4ltrs) of fully mixed product will give the following coverage rates –
146ft2 at 10 mil – 13.6m2 at 250 microns
4.2 gal (16ltrs) of fully mixed product will give the following coverage rates –
688ft2 at 10 mil – 64m2 at 250 microns

Please note that the coverage rates quoted are theoretical and do not take into consideration the profile or condition of the surface being repaired.

Cure Times

At 68°F the applied materials should be allowed to harden for the times indicated below before being subjected to the conditions indicated. These times will be extended at lower temperatures and reduced at higher temperatures:

Usable life 30 minutes
Minimum overcoating time 4 hours
Maximum overcoating time 36 hours
Water/sea water immersion 3 days
Chemical immersion 5 days

Pack Sizes

This product is available in the following pack sizes –
0.8 gallons (3.4ltr), 4.2 gallons (16ltr).


Base component – Light Grey, Dark Grey, Red or Blue
Activator component – Amber

Over-coating times

Minimum – the material can be over-coated as soon as it is touch dry, approximately 4 hours at 68°F.
Maximum – the over-coating time should not exceed 36 hours.
Where the maximum over-coating time is exceeded, the material should be allowed to harden before being abraded or flash blasted to remove surface contamination.

Storage Life

5 years if unopened and store in normal dry conditions (60-86°F)

Other Technical Documents

Safety Data Sheets – Base & Activator components
Product Specification Sheet – Technical Performance Information

Health and Safety

Please ensure good practice is observed at all times. Protective gloves, goggles & a disposable coverall must be worn during the mixing and application of this product. Before mixing and applying the material, ensure you have read the fully detailed Safety Data Sheet.

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