Waterborne Hyperbranched Direct-to-Metal (DTM) Paint-Holy Hong Chemical (Dalian) Co., Ltd.

Waterborne Hyperbranched Direct-to-Metal (DTM) Paint

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I. Product Description

This product is composed of water-based hyperbranched emulsion, pigment fillers, additives, and deionized water. It is a single-component, fast-drying, waterborne, temperature-resistant topcoat with low VOC content, making it safe, environmentally friendly, non-flammable, and non-explosive. It boasts excellent adhesion and corrosion resistance, delivers outstanding overall coating performance, and is easy to apply.

II. Recommended Uses

For repairing steel structural surfaces in environments ranging from mildly to severely corrosive, such as marine facilities like ships, containers, offshore platforms, and docks; petrochemical pipelines and storage tanks; as well as steel components in industries including metallurgy and power generation. Also recommended for indoor machinery and equipment, as well as for the decorative and anti-corrosion treatment of steel components.

III. Physical Parameters

Project	Instructions
Color	Agreed upon
Glossiness	Agreed upon
Volume solids content	38 ± 2% (varies depending on color)
150℃ temperature resistance	Slight discoloration within 72 hours
Smoke test	100℃—200℃

	Drying time		Coating time
Temperature	Surface dry	Hard work	Minimum	Maximum
25℃	50 minutes	6 hours	4 hours	7 days

The above-mentioned room-temperature curing data were measured under conditions of a dry film thickness of 30 microns and a relative humidity of 40–60%. Higher film thickness, insufficient ventilation, high humidity, or lower temperatures will all extend the curing time. Coatings that have undergone forced drying exhibit superior salt-spray resistance.

4. Film Thickness and Coating Rate

Project	Instructions
Dry film thickness	25-35 micrometers
Theoretical coating rate	10 m²/kg, 12 m²/L at 30 microns
Actual coating rate	Allow an appropriate loss coefficient.

V. Construction Reference

Project	Instructions
Mixing ratio	Single-component product
Air spraying	Recommended nozzle diameter: 1.0 mm
Airless spraying	Recommended nozzle diameter: 0.27–0.38 mm; filter mesh size: 120 mesh.
Brush coating application	Suitable for pre-coating and small-area repairs
Roller application construction	Suitable for small-area repairs; using a short-nap roller can achieve a better finish.
Diluent	Clean tap water
Dilution ratio	For airless spraying, brush coating, or roller coating: 0–5%; for air spraying: 0–10%.
Time can be made.	After use, any leftover paint should be promptly sealed and stored to prevent skinning and ensure proper usability.
Cleaning equipment	Immediately after use, clean the equipment with clean water. It is also recommended to periodically flush the spraying equipment during the construction process.
Work paused	Do not leave paint in the paint tube, spray gun, or spraying equipment. Thoroughly rinse the equipment with clean water.

6. Surface Treatment

Oil and grease shall be solvent-cleaned according to the SSPC-SP1 standard, sandblasted to Sa2.5 grade or derusted with power tools to St3 grade, achieving a surface roughness of 40–70 microns, and kept clean and dry.

Due to the nature of water-based coatings, they tend to flow away from sharp edges and corners, creating a “corner effect.” To protect these edges and corners from corrosion, it’s necessary to smooth them down and apply a primer coat beforehand.

Before construction begins, all surfaces must be assessed and prepared in accordance with ISO 8504. When applying water-based coatings, it is crucial to strictly adhere to all cleanliness standards.

VII. Precautions

During construction and drying, the ambient temperature should ideally be above 10℃ with relative humidity below 80%. The substrate temperature should be at least 3℃ higher than the dew point, and adequate ventilation must be ensured. Avoid outdoor construction during nighttime when temperatures are low, especially in seasons characterized by condensation or rainfall.

Post-coating: Single-component waterborne acrylic paint, single-component waterborne fluorocarbon paint, etc.; solvent-based coatings can also be applied over these, but compatibility tests must be conducted on-site. For specific matching recommendations, please consult Holy Hong’s technical sales engineers.

The durability of water-based paints largely depends on proper application. For instance, sharp edges, rivets, and areas with spot welding require extra care during application to avoid excessively thick paint films with each coat; it’s best to apply an additional touch-up coat.

Preparation and Cleaning Steps for Construction Equipment:
To prevent water-based coatings from being contaminated by solvents, the spraying equipment must be thoroughly cleaned before use. All equipment that comes into contact with solvents—such as pumps, pipes, and guns—must be completely cleaned according to the steps outlined below:

Before spraying: Circulate and flush the equipment and pipelines with the original solvent-based paint thinner, then use Holy Hong No. 1 thinner, and finally rinse with clean freshwater.

If the construction equipment is made of stainless steel and is specifically designed for applying water-based coatings, this preparation and cleaning work is not required.

8. Storage and Warranty

During storage and transportation, always take care to protect the product from freezing. The recommended storage temperature is between 4°C and 25°C. Store sealed in a cool place, with a shelf life of 12 months.

9. Health and Safety:

Since the paint liquid is not harmless, effective measures should still be taken to prevent skin and eye contact with the coating (such as wearing work clothes, gloves, goggles, face masks, and protective oils). If the product accidentally comes into contact with the skin, thoroughly wash it off with warm water and soap or an appropriate industrial cleaner. If the eyes are contaminated, rinse them with clean water for at least 10 minutes and seek medical attention immediately. It is recommended to wear a ventilated face mask to avoid inhaling paint mist and harmful volatile substances, especially when working in poorly ventilated environments. Disposal of paint waste must comply with national and local regulations.

Statement:

The above information and data are based on laboratory tests and practical experience. Due to individual circumstances (such as construction techniques, testing methods, or improvements in coatings), the data may vary. We reserve the right to modify this instruction manual without prior notice.

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