Gray Oxide Primer Powder Coating

Surface Finish Options Overview

GRAY OXIDE PRIMER

Gray Oxide Primer is very chemical resistant with special rust inhibitors, and a perfect coating for a corrosive environment.This product can be applied up to 30 MIL’s and is perfect for filling in dents, holes, or large imperfections. You can spray on ambient via electrostatic or simply use heat to build up the Gray Oxide Primer. You can pre-heat your part in an oven, use a heat gun, a torch, or any other heat source on your substrate to get your primer build up if needed. After you fill in your imperfections, sand the primer to a smooth finish and you are now ready to apply your topcoat.Gray Oxide Primer also helps stop outgassing, by pre-heating your part/substrate to a temperature between 300 – 500F, you can apply this primer on hot to get a heavy build up, to entrap the outgassing. This product’s gel time is quick, and depending on the substrate you might not need to put the part back in the oven before applying your topcoat, most of the time it’s gelled out enough to go ahead and apply your topcoat, then fully cure to crosslink your coatings together.

BONDED EPOXY

FULL CURE SCHEDULE 462F/1 MINor 438F/2 MINor 400F/5 MINor 375F/10 MIN @ PMT (PART METAL TEMPERATURE)SPECIFIC GRAVITY = 1.44 THEORETICAL COVERAGE = 134SQ. FT./LB/MIL. IMPACT RESISTANCE = @ 25°C (77°F) 160 IN.LBS. RECOMMENDED FILM THICKNESS = ANYWHERE FROM 3-14 MILS. (CAN APPLY UP TO 30 MILS.)

FAQ

1. What is Powder Coating?

Powder coating is a dry finishing process used to apply a protective and decorative coating on metal or other surfaces. Instead of using liquid paint, fine powder particles (usually made of polyester, epoxy, or hybrid resins) are electrostatically charged and sprayed onto a conductive surface. The coated object is then baked in an oven, where the powder melts, flows, and cures into a smooth, durable finish.

Key features:

Durable, hard finish

Resistant to scratches, corrosion, and UV

Environmentally friendly (no VOCs)

2. Benefits of Powder Coating

Powder coating offers several advantages over traditional liquid painting:

Durability: Resistant to chipping, scratching, fading, and wear.

Corrosion Protection: Provides excellent protection against rust and chemicals.

Environmentally Friendly: No volatile organic compounds (VOCs) and minimal waste.

Efficiency: Overspray can be collected and reused, up to 99% material utilization.

Uniform Finish: Smooth, even coating without runs or drips.

Cost-Effective: Single-coat systems can achieve high film thickness, reducing labor and energy.

Aesthetic Variety: Wide range of colors, textures, and effects.

3. What Temperature to Cure Powder Coating

The curing temperature depends on the type of powder used:

Epoxy powder: ~160–200°C (320–392°F)

Polyester powder: ~180–210°C (356–410°F)

Hybrid (Epoxy-Polyester) powder: ~180–200°C (356–392°F)

Typical curing time: 10–20 minutes depending on thickness and oven type.

Always follow the powder manufacturer’s specifications for best results.

4. Process for Powder Coating

The powder coating process usually follows these steps:

Surface Preparation:

Clean the surface thoroughly (remove oil, grease, rust, or dirt)

Methods: chemical cleaning, sandblasting, or phosphating

Pre-Treatment:

Apply a conversion coating or primer if needed to improve adhesion

Powder Application:

Spray the powder using an electrostatic spray gun or fluidized bed

Curing:

Bake the coated object in an oven at the recommended temperature for the powder type

The powder melts and forms a continuous, smooth film

Cooling & Inspection:

Let the coated item cool

Inspect for defects, uniform coverage, and desired thickness

5. How to Spray Powder Coat

Equipment Needed:

Electrostatic spray gun

Compressed air supply

Powder feed hopper or container

Grounding of the object

Steps:

Ground the object: Ensures the charged powder is attracted to the surface.

Spray evenly: Hold the gun 6–12 inches from the surface, moving in smooth, overlapping strokes.

Apply sufficient powder: Ensure full coverage without excessive buildup.

Cure immediately: Transfer the sprayed item to the curing oven to fuse the powder into a solid coating.

Tips:

Maintain consistent speed and distance while spraying.

Use proper ventilation to reduce airborne powder accumulation.

Test a small area to check film thickness and color before full application.