Coal Tar Epoxy- Meaning, Lending Properties & Application

When it comes to safeguarding surfaces subjected to exceptionally corrosive environments, coal tar epoxy coatings find application. This coating is a powerful blend of refined coal tar and epoxy resins. The resultant high solid coatings and paints made from coal tar epoxies are used to provide prevention against moisture and microorganisms in underground systems. These systems include tanks, pipelines, water treatment facilities, sewage areas, etc. 

When a surface is treated with coal tar epoxies, it gets a number of properties, as discussed in the following section. 

Properties Provided By Coal Tar Based Epoxies

  • It helps in developing paints and coatings that can be easily applied using a brush, spray, or roller.
  • Since it bonds greatly with oily surfaces, it is chosen to coat garages. 
  • The paints and coatings produced by these epoxies are resistant to corrosion, abrasion, impact, chemical, and thermal shock. 
  • Protection against soil stress is also provided.
  • Provides a matte finish to the surface.
  • Provides paints and coatings with self-adhesion and self-priming capacities.

Application Of Coal Tar Based Epoxies

The application process includes the following steps:

  1. Preparation Of Surface
  • Before the coating is applied, the surface is cleaned with a fine brush. Here, all the dust, dirt, oil, and contaminants are removed to make the surface even and ensure a proper bond to the surface.
  • The next step includes verifying that the concrete is dry. For this, a plastic sheet is placed on the surface and the edges are taped. If the surface below the plastic sheet remains dry after 24 hours, then it means it is ready for the coating.  
  • This plastic sheet method also signifies if any hydrostatic pressure problems exist and cause lifting later. 
  1. Mixing The Product
  • To mix the product, a product mix ratio of 9:9 is followed for component A and component B. 
  • Mix both the component in equal volumes thoroughly. Once the mixture is properly mixed, transfer it to another pail so that it can be applied. 
  • Improper mixing may lead to product failure.
  1. Priming

In the case of these coatings, the primer does not play an essential role. However, a suitable primer can be applied if the surface is too porous. This primer will help remove surface issues that may result from the surface’s air release.

  1. Application

The mixture is then applied to the surface using a brush, roller, or squeegee. Till the appropriate thickness is achieved, the mixtures are rolled on the surface. During the application and curing process, apt temperatures are maintained. 

In case any air entrapment is caused due to concrete conditions or over aggressive blending, then an air releasing rolling tool is used to remove that entrapped air.

  1. Top Coating

Before top coating, the coating is tacked off and all the previous coats are de-glossed to ensure a bond, without any problems. Plus, no epoxy blushes should be developed on the coating, before recoating. 

  1. Cleaning

After the coating and recoating, when it comes to cleaning, make sure that the cleaning agent (for example, xylene) does not have a poor effect on the surface. For this, check it on a small surface first. Once you are sure, you may continue cleaning it with the agent. 

Conclusion

The pyp kote AW Primer is a synthetic primer by IWL India that effectively adheres coal tar pypkote tapes to mild steel surfaces. Visit the website to know more about coatings, tapes, waterproofing membranes, etc. by IWL India Ltd. Get in touch for inquiries.

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