Dachin H53-90
Cold spray zinc sealing agent

Main Composition

A two-component, low-VOC, high-solids, self-drying, thick-bodied epoxy resin coating composed of modified epoxy resins and mica flakes.

Main Characteristics

Specifically developed as a cold spray zinc sealer, this product combines the functions of a sealing primer and an epoxy mica intermediate coating. It features strong penetration, excellent shielding protection, high adhesion, and compatibility with various topcoats. The inclusion of mica flakes improves long-term recoatability, enabling factory application followed by final field recoating.

Main Applications

Widely used on structural steel in wind power, bridges, offshore engineering, petrochemical plants, paper mills, etc. Complies with standards: "JT/T 722-2023 Bridge Steel Structure Anti-corrosion Coating Technical Specifications" and "JT/T 1266-2019 Cold Spray Zinc Anti-corrosion Technical Specifications for Bridge Steel Structures".

Technical Specifications

Film Color and Appearance	Grey, uniform and smooth surface
Volume solids content, %	70.0±1
Density, kg/L	1.53±0.05

Package Specifications

	Package Weight / kg	Package Volume / L
A	27	15.3
B	4.5	4.7
Total	31.5	20

Basic Parameters

Mix Ratio	Weight ratio A:B = 6:1 Volume ratio A:B = 3.2:1
Pot Life	5℃: 3h; 15℃: 2.5h; 25℃: 2h
Theoretical Consumption	Approx. 7㎡/L @ 100μm

Recoat Interval

Temperature	Surface Dry	Hard Dry	Recommended Topcoat Recoat Interval
			Minimum	Maximum
5℃	6 hours	24 hours	24 hours	3 months
15℃	5 hours	18 hours	18 hours
25℃	3.5 hours	12 hours	12 hours
40℃	2 hours	6 hours	6 hours

Data based on standard film thickness applied on steel substrate.

application

Dachin H53-90 Cold Spray Zinc Sealer uses airless spraying for single-coat application. Surface temperature must remain at least 3℃ above dew point with humidity <85%. Ensure ventilation in enclosed spaces.

Dachin DZ-6000 Cold Spray Zinc contains high zinc powder content, creating a porous surface. Although atmospheric curing forms zinc salts to seal pores over months, most structures require immediate recoating.

Exceeding 50μm in single coat may cause bubbles/holes; over 200μm risks solvents dissolving the zinc coating.

Recommended solution: Clean zinc surface, apply a 25-30μm mist coat, wait 4+ hours, then build to desired thickness. This prevents solvent migration and pore blockage.

Mica flakes slow solvent evaporation. Avoid topcoating before minimum interval. If solvent entrapment occurs, cure at elevated temperatures/ventilation to restore adhesion.

Compatible Coatings

Undercoat: Dachin DZ-6000 Cold Spray Zinc

Topcoat: Dachin PU 770 Polyurethane, Dachin PS 990 Siloxane, Dachin FC 880 Fluorocarbon.

Spray Thickness

Airless spray: 100μm; Brush/Roller: 75μm.

Surface Preparation

Clean substrate free of oils/dust.

Before sealing cold spray zinc: Ensure surface is clean, dry, free of zinc salts, and fully cured.

Recoat within specified intervals on cured primers. Repair damaged areas to Sa2.5 standard before sealing.

Mixing

Product consists of Base (A) and Hardener (B). Thoroughly mix each component with power tools before use. Mix strictly by ratio and homogenize.

application Methods

Application Method	Diluent	Dilution Rate	Nozzle Orifice	Pressure
Airless Spraying	Dachin Thinner X17	0-5%	0.53-0.635mm	≥190 kg/㎡ at nozzle
Air Spraying	Dachin Thinner X17	0-10%	1.8-2.5mm	0.3-0.5 MPa
Roller/Brush	Dachin Thinner X17	5-10%	-	-

Dilution rates are volume-based.