Latest News

Our E-Coating Process – Start-to-Finish

Our E-coating process – start to finish

Following our look at the automated powder coating facility, this blog details our E-coating process from start-to-finish.

E-coating, also known as EPD or electrophoretic painting is a complete submersion process that is becoming increasingly popular due to its low cost and ability to easily coat complex or hard-to-reach areas evenly. E-coating can be used as a corrosion-resistant primer, or as a standalone process for parts that won’t be exposed to UV light, and is commonly used in the automotive sector for parts such as brackets and tow bars.

Our dedicated E-coat facility operates using a 12 stage process that includes a zinc phosphate pre-treatment and full immersion coating of the product. Similarly to our automated powder coating process, before parts can go through pre-treatment and coating, the surfaces need to be prepared through shot blasting or other methods.


Stage 1 – Degreaser

After being loaded onto the motorised track, parts are submerged in a tank of alkaline cleaner. This removes any contaminants from the surface of the product.

Stage 2 & 3 – Rinse

Parts then go through a 2 stage rinse to ensure no residue is present prior to pre-treatment.

Stage 4 – Conditioner

An activator is used prior to coating with zinc phosphate. This encourages crystal growth during the pre-treatment and helps to produce a finer phosphate finish.

Stage 5 – Pre-treatment

Zinc phosphate is then applied to the product to improve paint adherence and corrosion resistance.

Stage 6 & 7 – Rinse

A second two-stage rinse cycle is used to remove any phosphate residue.

Stags 8 – De-ionised water bath

Deionised water immersion is then used to remove any water-soluble materials from the product prior to coating.


Stage 9 – E-Coating

Once the pre-treatment process is finished, parts are ready to be coated. The parts are lowered into the electrically charged paint tank until fully submerged, causing the deposition of the e-coat paint onto the product.

Stage 10 – UF

Once E-coated, parts go through a 2 stage Ultrafiltration bath to remove any undeposited paint and collect excess to be reused.

Stage 11 – Oven curing

Similarly to the powder coating process, the coated parts then go through an oven curing process to harden the coating into a finished product.

Stage 12 – Quality check

The final stage is the quality check. Parts are examined for any visual defects with the finish, as well as the thickness of the E-coat being measured digitally to ensure adherence to the required specification. Once passed, parts are then packaged for delivery to the customer.

You can see some examples of our finished e-coating process below, or contact us today for your own personalised service.

ISO Standards

We are proud to have attained certification for Quality, Environmental and Health & Safety Management for our Shotblasting, Powdercoating, Paint spraying, Metal spraying, and Electrophoretic Deposition (EPD) for Commercial, Industrial, Automotive and Rail metalwork.

Proud to have worked with:

  • APB
  • Broadcrown

Great reasons to use Pym&Wildsmith

Wide range of services for a complete metal finishing package

Facility for large scale items up to 6.45 metres

Quick turnaround times available.