Surface Preparation

Surface Preparation & Pretreatment

A flawless and long-lasting powder coating finish begins with proper surface preparation and pretreatment. At Rainbow Powder Coating, we use a combination of mechanical, chemical, and thermal techniques to ensure that every substrate is free of contaminants, properly profiled, and ready for coating. These steps are critical for achieving strong adhesion, corrosion resistance, and long-term performance.

Our Preparation Methods

1. Paint Stripping

   • Chemical stripping for intricate parts where blasting could damage details

   • Thermal stripping for heavy coatings or multiple paint layers

2. Sandblasting

   • Creates a uniform surface profile for optimal powder adhesion

   • Removes rust, scale, and contaminants effectively

   • Suitable for steel, aluminum, and other alloys

3. Mechanical Rust Removal & Buffing

   • Power tools used to remove rust and surface irregularities

   • Filler buffing prepares surfaces for smooth, defect-free finishes

4. Pretreatment for Corrosion Resistance

   • Chromate-free conversion coatings enhance adhesion and provide corrosion resistance while meeting modern environmental standards

   • Customized treatments for ferrous and non-ferrous metals to match project requirements

Why Pretreatment Matters

• Properly prepared surfaces prevent peeling, chipping, or premature coating failure

• Pretreatment layers shield against rust and oxidation, extending product life

• Smooth, clean, and profiled surfaces ensure even coverage and a premium appearanceUse of chromate-free coatings supports sustainable and eco-friendly practices

Applications

Our surface preparation and pretreatment services support a wide range of projects, including:

• Architectural aluminum (façades, windows, doors, louvers)

• Industrial equipment and machinery

• Outdoor furniture and fixtures

• Automotive and restoration parts

• Decorative and functional metalwork