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Construction Process for UV Wood Finish

Release time:

2026-04-07 23:25

The application process for UV wood topcoats encompasses the entire sequence of operations, from completion of primer treatment to final curing of the topcoat. A standardized application procedure is the foundation for ensuring consistent topcoat quality. Unlike primer application, topcoat application places greater emphasis on surface appearance and imposes stricter requirements on process parameters and operational details.

I. Primer Layer Inspection and Treatment

Prior to applying the topcoat, a thorough inspection and treatment of the primer layer is required. First, examine the primer surface for defects such as sagging, orange-peel texture, and bubbles; any imperfections in the primer will be magnified after the topcoat is applied. Next, perform fine sanding of the primer to eliminate minor surface irregularities—high-gloss topcoats demand even finer sanding. Once sanding is complete, the workpiece surface must be meticulously cleaned to remove all dust; incomplete dust removal can result in particle defects in the topcoat.

II. Preparation of the Construction Environment

The application of topcoat coatings is subject to stricter environmental requirements than that of primer coatings. During topcoat spraying, the work area must maintain a high level of cleanliness, and the spray booth should be equipped with an air filtration system. Ambient temperature and humidity can affect the leveling and curing performance of the topcoat; therefore, these parameters should be adjusted to appropriate ranges prior to application. In addition, the spraying operation requires a well-designed ventilation and exhaust system.

III. Topcoat Application

The appropriate coating method should be selected based on the workpiece geometry and production volume. For flat panels, roll coating is the most commonly used method; precise control of the coating application rate is essential, as undercoating can result in poor leveling, while overcoating may lead to sagging. For irregularly shaped workpieces, spray coating is the primary method, requiring a constant gun-to-workpiece distance and uniform travel speed. For high-gloss finishes on large-area flat panels, curtain coating is the ideal choice.

IV. Flow and Curing

After coating is completed, the workpiece must undergo a leveling period to allow the coating to spread evenly and eliminate any application marks. The leveling area should be kept clean to prevent dust from settling on the wet film surface. Once leveling is complete, the part proceeds to the UV curing stage, where the curing energy must be adjusted according to the type and thickness of the topcoat. Insufficient energy can result in incomplete curing, while excessive energy may lead to yellowing. For high-gloss topcoats, nitrogen-protected curing can be employed to enhance surface cure performance.

V. Cooling and Inspection

After curing, the workpiece surface temperature is relatively high and must be cooled to ambient temperature to prevent adhesion during stacking. Following cooling, a quality inspection is conducted: under appropriate lighting conditions, the coating surface is examined for defects such as sagging, orange peel, bubbles, and particulates; a gloss meter is used to verify that the gloss level meets specifications; and random sampling tests are performed on adhesion and other performance characteristics in accordance with product requirements.

VI. Conclusion

The application process for UV wood topcoats comprises five main stages: inspection and treatment of the primer layer, preparation of the application environment, topcoat application, leveling and curing, and cooling and inspection. Compared with primer application, topcoat application places greater emphasis on surface finish and environmental control, with stricter requirements for operational details. A standardized application procedure is the foundation for ensuring consistent topcoat quality; only by rigorously following each step can the decorative and protective functions of the topcoat be fully realized.

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Bossin Recommended Products – UV Wood Coatings
Glossy topcoat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA.
B-163	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-165	Modified epoxy acrylate	Good flexibility and strong adhesion
B-21C	Active amine photosensitizing promoter	Low color number, antioxidant and anti-polymerization, and enhanced curing rate
B-301	Aromatic Polyurethane Acrylate	Fast curing, excellent toughness, and good grindability.
B-302	Aromatic Polyurethane Acrylate	Fast curing, high strength, good toughness, and excellent grindability.
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability; suitable for LED UV.
B-601	Aromatic Polyurethane Acrylate	High hardness, scratch resistance, chemical resistance, and excellent cost performance.
B-609	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch resistance, and chemical resistance.
B-868	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-868H	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-910A2	Aliphatic polyurethane acrylate	Low viscosity, yellowing resistance, chemical resistance, and steel-wool resistance.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and outstanding chemical and wear resistance.
Matte topcoat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and strong adhesion.
B-163	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-21C	Active amine photosensitizing promoter	Low color number, antioxidant and anti-polymerization, and enhanced curing rate
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, excellent wettability, and a pleasant hand feel.
B-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting, good wetting, and a fine, smooth, and silky hand feel.
B-333	Aliphatic polyurethane acrylate	Low viscosity, excellent matting effect, good wettability, and good flexibility.
B-572	Polyester acrylate	Low viscosity, low odor, excellent wettability; suitable for LED UV.
B-650A	Aliphatic polyurethane acrylate	Low viscosity, excellent matting effect, fast curing, and good wettability.
B-868	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-868H	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-910A2	Aliphatic polyurethane acrylate	Low viscosity, yellowing resistance, chemical resistance, and steel-wool resistance.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and outstanding chemical and wear resistance.
Bright White Finish
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA.
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and strong adhesion.
B-301	Aromatic Polyurethane Acrylate	Fast curing, excellent toughness, and good grindability.
B-302	Aromatic Polyurethane Acrylate	Fast curing, high strength, good toughness, and excellent grindability.
B-560	Polyester acrylate	Fast curing and excellent pigment wetting
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability; suitable for LED UV.
B-601	Aromatic Polyurethane Acrylate	High hardness, scratch resistance, chemical resistance, and excellent cost performance.
B-868	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-868H	Organosilicon UV-Curable Resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and outstanding chemical and wear resistance.
Individual Recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
BM2223 (TPGDA)	Di(propylene glycol) diacrylate	Good flexibility and low volatility
BM2224 (EO-HDDA)	Ethoxylated 1,6-hexanediol diacrylate	Excellent adhesion to plastics, good dilutability, and low volatility.
BM3231 (TMPTA)	Trimethylolpropane triacrylate	High crosslink density, high hardness, high gloss, and excellent wear resistance.
BM3235 (PET3A)	Pentaerythritol triacrylate	Fast curing, high crosslink density, high hardness, and excellent chemical resistance.
BM3380 (3EO-TMPTA)	Ethoxylated trimethylolpropane triacrylate	More flexible and less irritating than TMPTA.
BM6261 (DPHA-80)	Dipentaerythritol hexaacrylate	High crosslink density, high hardness, chemical and wear resistance, and water resistance.
BM6263 (DPHA-90)	Dipentaerythritol hexaacrylate	High crosslink density, high hardness, chemical and wear resistance, and water resistance.

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