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Various Processes for UV Wood Primer

Release time:

2026-03-31 23:29

In the practical application of UV wood primers, a single type of primer often fails to meet all requirements, necessitating the use of various process combinations to achieve the desired coating performance. Common techniques in the coating process include combining primer with putty, applying multiple coats of primer, matching primer with topcoat, and sanding. Understanding the characteristics and appropriate application scenarios of these processes helps in developing a rational coating plan tailored to specific product requirements.

I. Combined Application Process of Primer and Putty

When significant defects are present on the wood surface, a single primer often struggles to simultaneously fill and seal these imperfections. A common approach is to use a combination of UV putty and UV primer: first apply the UV putty to fill the wood’s pores, cracks, and depressions; after curing, sand the surface to remove excess putty and achieve a smooth finish. Then apply the UV primer to provide fine-level filling and sealing. This combined process effectively enhances the smoothness and sealing performance of the coated surface.

II. Multi-Coat Primer Process

For coatings requiring high fill and excellent coverage, a multi-coat primer system is often employed. After the first primer coat has cured and been sanded, a second primer coat is applied; this process can be repeated as many times as necessary. Sanding is performed between each primer coat to ensure intercoat adhesion and surface smoothness. This multi-coat primer technique produces a thicker film with superior covering power, making it ideal for high-end furniture and flooring applications.

III. Matching Application Process for Primer and Topcoat

The proper selection of application methods is essential when pairing UV primers with various topcoats. When used with UV topcoats, the primer is sanded after curing, followed by direct application and curing of the UV topcoat to form a fully UV-based coating system. When paired with waterborne topcoats, the primer is sanded after curing, then the waterborne topcoat is applied and allowed to dry naturally or dried with hot air. When used with polyurethane topcoats, the primer is sanded after curing, then the polyurethane topcoat is applied and allowed to cure naturally or through baking. The specific application procedures for each combination must be tailored by adjusting process parameters based on the characteristics of the primer and the topcoat.

IV. Sanding Process

Sanding is an indispensable step in the primer-coating process. Common sanding methods include hand sanding, air-cushion sanding, and wide-belt sanding. Hand sanding is suitable for small batches or workpieces with complex geometries; it offers flexibility but low efficiency. Air-cushion sanding is ideal for curved and irregularly shaped workpieces, delivering uniform sanding results. Wide-belt sanding is best suited for flat panels, offering high efficiency and excellent surface smoothness. The sanding process requires selecting abrasive belts or sandpaper of the appropriate grit: coarse grit is used to remove obvious defects, while fine grit is employed for precise leveling. After sanding, surface dust must be thoroughly removed to ensure adequate adhesion for subsequent coating applications.

V. Conclusion

The preceding section has outlined several commonly used application methods for UV wood primers. The combination of primer and putty is suitable for substrates with numerous defects, while multi-coat primer systems are ideal for products requiring high film build and fullness. The pairing of primer and topcoat must be tailored to the specific type of topcoat, and sanding is an indispensable step between each coating pass. In actual production, these application methods should be selected and combined appropriately based on product requirements and substrate conditions to achieve optimal coating performance.

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Bossin Recommended Products – UV Wood Coatings
Putty primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
Sanding primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and excellent adhesion.
B-163	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
Apply primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-02	Phosphate ester acrylate	Enhances adhesion to substrates such as metal, glass, and plastic.
B-05	Phosphate ester acrylate	Enhances adhesion to substrates such as metal, glass, and plastic.
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-165	Modified epoxy acrylate	Good flexibility and strong adhesion
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
B-535	Polyester acrylate	Excellent adhesion, rapid curing, good flexibility, and yellowing resistance.
B-546	Polyester acrylate	Good adhesion, fast curing, and excellent flexibility.
White primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and excellent adhesion.
B-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
B-529	Polyester acrylate	Good adhesion, low shrinkage, and excellent resin compatibility.
B-560	Polyester acrylate	Fast curing and excellent pigment wetting
Single-item 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	Good 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)	Tripropylene Glycol 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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