Decorative Finishes



EDP coating, also known as E-Coat or Electrophoretically Deposited Paint, is ideally suited for application to wrought and cast steels/irons, zinc or aluminium die cast products, bronze-welded and zinc-coated steels.

Unlike other electroplated or powder coated processes, the EDP process is capable of coating deep recesses in complex shapes while maintaining a uniform thickness. The method provides a corrosion resistance under neutral salt spray test conditions between 840 – 2000 hours. This system is environmentally friendly, and this form of coating has enabled the automobile and outboard motor manufacturers of the world to give six-year corrosion warranties in worldwide markets under severe salted roads and saltwater environments.

Our two machines provide increased capacity, reliability and flexibility. Our coatings are accepted and incorporated in worldwide exports with some of the strictest of environmental controls.


Process Description: “EDP” (otherwise commonly known as E-Coat, or electro-paint) is more technically termed “Cathodic Electrophoretically Deposited Paint”.
The paint formulation applied is the latest lead-free type “medium build” epoxy.
The process, which is fully automated and PLC controlled, utilises 10 preparatory immersion steps including cleaning and fine grain zinc phosphating before the painting stage. Post painting, the coating is oven-cured at 175 C.


The design of parts should take metal finishing processes into consideration. Lack of suitable drainage will cause pooling defects. Lack of air release will cause air pockets where protective coating is not applied. Blind holes will cause staining and build-up of paint around the hole. Very small diameter holes can randomly block with paint. Threaded parts need to allow for paint thickness. Suitable racking holes will minimise contact marks.

If you are looking for a proven and reliable metal coating system for your products, we are confident that you will benefit from speaking with our expert EDP coating specialists.


Hardness: Minimum scratch hardness- 4H pencil equivalent; high level of abrasion resistance in general usage

Colour and gloss: Black, semi-gloss maintained to approved standard limits

Paint film build: 15 or 20-micron minimum up to 35-micron maximum (controllable)

Corrosion resistance: Per 5% Neutral Salt Spray Test to AS2331.3.1- 2001 (ASTM B117) for 20¼ m coat, 840hrs + to onset of red rusting or < 3mm corrosion undercut or loss of adhesion from the edge of pre-scribed X lines. Applied over zinc-plated steel, the corrosion resistance increases from 840 hrs to up to 2000 hrs depending on zinc thickness

Adhesion: As described by the above corrosion testing and also by a standard peel-off adhesive tape test where no square or part thereof of the paint coating shall be removed from a 10X10, 1mm scribed line grid. In practical service, the coating will not chip or peel away from a scratch
Warm water immersion resistance: Nil degradation after 1000hrs at 50C

Temperature resistance: Nil degradation or loss of adhesion in air at temperatures of up to 140 C, either constant or cycling to room temperature

Chemical resistance: Resistant to mineral and vegetable oils, hydraulic fluids, glycols, gasoline, weak acids, and common organic solvents. Not resistant to warm caustic

Ultra violet radiation: Poor resistance to prolonged exposure – will degrade by slow colour fade and chalking. Where prolonged exposure is expected, this may be readily overcome by the application of a simple acrylic, enamel or powder topcoat

Lead-free: All 2 Wilcox lines utilise the latest generation lead-free paint formulation

Conformance to automotive company requirements: Meets a large range of automotive specifications for applications requiring under-body corrosion resistance to severe environments resistance to corrosion initiation by stone chipping (gravelometer tests), etc.: – e.g. TSH 2354G, GMW 14671, HN 2194, WSS-MSP 182, M64 J28, M2P 185

Environmental: ROHS compliant and listed with IMDS

Thread Friendly: With the controlled coating of 20 microns, nuts and bolts down to M3 size will easily thread together