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Coatings technical information &
industrial coatings

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Basics of... Coatings

Why Should I "Coat" Rather Than Paint

Coating, unlike paint, will inhibit corrosion, reduce chemical and solvent attack, and reduce erosion of the properly coated surface

  • Protective coatings are used mainly to protect steel and concrete surfaces
  • A coating system is an inexpensive way to protect the physical assets of the facility

The majority of the coatings used as ‘maintenance’ coatings are easy and convenient for in-house maintenance crews to use.

There are five coating types which are used for maintenance:

Alkyds, Acrylics, Epoxies, Polyurethanes & Aerosols

ALKYDS

Advantages:

  • Mild to moderate industrial uses
  • Easy to use
  • Good general maintenance coating
  • Very versatile
  • Available in a wide color selection

Limitations:

  • Not for severe industrial conditions
  • Only fair outdoor gloss retention
  • Not for use on galvanized steel or concrete surfaces
  • Possible fire and health hazards from solvents when used in some environments

ACRYLICS

Advantages:

  • Mild to moderate industrial uses
  • Easy to use
  • Good general maintenance coating
  • Low odor
  • Excellent outdoor color /gloss retention
  • Suitable for galvanized steel and concrete surfaces

Limitations:

  • Surface must be free of oil and grease
  • There can be restrictions on ambient temperatures during application
  • Very high gloss is not available

EPOXIES

Advantages:

  • Severe industrial uses
  • Excellent chemical resistance
  • Excellent abrasion resistance
  • Excellent corrosion control
  • Suitable for water immersion

Limitations:

  • Surface must be free of oil and grease
  • There can be restrictions on ambient temperatures during application
  • Very high gloss is not available

POLYURETHANES

Advantages:

  • Excellent chemical resistance
  • Excellent abrasion resistance
  • Excellent corrosion control
  • Good outdoor gloss retention

Limitations:

  • Contains Isocynates which may lead to health concerns

AEROSOLS

Advantages:

  • Convenient to use for small jobs, touch-ups, stenciling

Limitations:

  • Mostly available in alkyds - (not suitable for severe environments due to fair outdoor gloss retention)
  • Small package size
  • Potential for overspray

Surface Preparation Tips

  • Over 75% of all premature coating failures can be attributed to improper surface preparation
  • For proper adhesion the surface must be washed to remove all grease, oil, dirt, and other contaminates
  • Must use an appropriate method of mechanical cleaning to remove all loose, unsound rust, scale, or previous coatings
  • Tightly adhering rust, scale, or previous coating can remain
  • Priming the surface is recommended to achieve the best topcoat adhesion, which results in long term durability
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