One-component polyurethane moisture curing primer MT-85B

Surface Finish Options Overview

Product Description

MT-85B one-component primer is a one-component polyurethane primer. MT-85B one-component primer cures by reacting in moist air to form a tough coating with corrosion and wear resistance. MT-85B one-component primer can thoroughly penetrate porous and water-permeable surfaces and has high adhesion to concrete surfaces. MT-85B one-component primer is one of the ideal primers for polyurea and polyurethane elastomer coatings.

Typical performance

Surface treatment

All surfaces must be clean and dry.

All previous paints, coatings or lacquers on the substrate must be completely removed unless they are strong and tightly adhered.

Packaging and mixing

Supply form: MT-85B one-component primer is a one-component paint, packed in 200-liter barrels, 200 kg per barrel.

Smaller packages (20 liter and 50 liter packages) can also be configured as needed.

From the time of transportation, the storage period is 6 months, and the storage conditions are: storage in a ventilated room at 5-35℃.

Before use, do not open the lid. Open the lid and use it.

Construction

MT-85B single-component primer should be applied by brush or roller. It can also be applied by single-component spraying.

For mortar base surface, it is generally necessary to apply one coat of MT-85B single-component primer at a coating rate of 0.2-0.25kg/square meter, and then proceed with subsequent construction.

MT-85B single-component primer should be topcoated within 12-48 hours after construction. If the topcoat construction cannot be completed within 48 hours, it is recommended to re-apply MT-85B single-component primer.

After painting, it should not rain within 24 hours. If it rains, it is necessary to check the curing of the coating film and re-apply the primer if necessary.

Restrictions and Warnings

MT-85B one-component primer is susceptible to moisture and must be protected from moisture contamination. Keep sealed. Containers must be sealed with a volatile gas to prevent contamination. After opening, if all components have not been used up, fill with nitrogen or dry gas and seal with wax.

MT-85B one-component primer in the can is flammable. Use only in well-ventilated areas. Avoid heat, fire, flames and fireworks. Use explosion-proof construction equipment. Avoid prolonged or repeated inhalation of vapors or sprays. Applicators should wear approved gas masks. Avoid contact with eyes and skin.

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.