Polyester coating for wood furniture finishing.
A high gloss finish with polyester coating
Polyester coating is the coating that contains polyester resin as its main ingredient. Polyester resin is a polymer made from the reaction of polybasic acids and polyhydric alcohol. Polyester coating can produce a thick film that is strong and hard. The film resulted has high resistance to scratches, chemicals, heat, and any other physical abuses. Since then, this paint is widely used for finishing on products that require maximum protection. The polyester paint is also used to finish outdoor products such as fencing or garden furniture. For indoor purposes, polyester is widely used for finishing the products that need maximum protection, such as office cabinets, desks, or chairs made from metal. Polyester is also widely used as a finishing material on ceramic such as cups, plates, bowls, etc.
Polyester for wood finishing.
Most of the polyester paint is used to do the finishing process on the products that prioritize protection more than decorative value. This coating is rarely used to finish the wood furniture products. The difficulty in its application and its relatively less clear appearance make this coating not too popular to be used in wood furniture finishing. The wood furniture usually needs finishing that emphasizes enhancing the beauty of the wood.
Nevertheless, there are some models of wood finishing that is more easily achieved by using the polyester coating. A finishing with clean-looking, close pores and thick film layer would be easier to be achieved with the polyester coating. The polyester coating will produce a thick and thermosetting film layer that is strong and highly resistant to chemicals, scratches, and heat. The hardness and durability of this coating is even greater than the PU coating. Yet since its difficulty in handling and application, a wood finishing with polyester coating as a full system is quite rare. The combination of polyester with NC or PU is more widely used in the wood furniture finishing.
Most of the polyester paint is used to do the finishing process on the products that prioritize protection more than decorative value. This coating is rarely used to finish the wood furniture products. The difficulty in its application and its relatively less clear appearance make this coating not too popular to be used in wood furniture finishing. The wood furniture usually needs finishing that emphasizes enhancing the beauty of the wood.
Nevertheless, there are some models of wood finishing that is more easily achieved by using the polyester coating. A finishing with clean-looking, close pores and thick film layer would be easier to be achieved with the polyester coating. The polyester coating will produce a thick and thermosetting film layer that is strong and highly resistant to chemicals, scratches, and heat. The hardness and durability of this coating is even greater than the PU coating. Yet since its difficulty in handling and application, a wood finishing with polyester coating as a full system is quite rare. The combination of polyester with NC or PU is more widely used in the wood furniture finishing.
The polyester sealer followed with the PU or NC top coat is more often used to make a fully closed pores finish with thick film. This system may help to overcome some quality problems with the wood substrate. Some imperfections in the unfinished wood that could be a problem to make a flat and smooth surface in small level can be solved with this coating. This coating can produce finish with a thick layer that can hide the small dents and the uneven surface caused by the wood pores and grain structure. This finish is more secure than the other type of clear coating. On a nitrocellulose-type finish, finishing with a film thickness greater than 5 mills is high risk of getting cracked. But with polyester coating, a film thickness of about 10 mills is still considered safe.
The application
Polyester coating is rather difficult to be handled and applied. This paint consists of 3 components: coating materials and the activator and hardener. Instead of those three components, you will still need thinner to reduce and adjust the coating in application. These three components should be mixed with the right composition when it applied. The mixing process should be done carefully. The activator should not be mixed directly with the hardener. because of the risk of an explosion that could endanger the people nearby. The safe way to mix these materials is as follow: Divide the coating into 2 parts, 1 part is mixed with the hardener, while the other part is mixed with the activator. Some thinner may be needed to adjust the viscosity to control the application. Then mix those two parts together and stir it to make it ready to use. Then spray the mixture of material and layer it on the desired surface. Make sure you spray in enough thickness to build the film coating. The material also has a short pot life. The coating is going to dry and gel in about 15 minutes after they are mixed.
The three components of polyester coating that have been mixed should be applied soon because it has a short pot life. In mass production, which does the finishing process for a big volume product, the coating is applied with special spraying equipment. The spraying machine is equipped with a special pump to flow the three materials separately to the spray gun. The three finishing materials: paint, harderner, and activator are flown and mixed in the right composition and flowed in the gun nozzle, where it will be atomized and directed to the desired surface. With this equipment, the coating application can be done quickly and continuously.
For use on a small scale, the cup gun can be used with the proper schedule. The proper amount of mixing is needed to reduce the risk of material waste.
The three components of polyester coating that have been mixed should be applied soon because it has a short pot life. In mass production, which does the finishing process for a big volume product, the coating is applied with special spraying equipment. The spraying machine is equipped with a special pump to flow the three materials separately to the spray gun. The three finishing materials: paint, harderner, and activator are flown and mixed in the right composition and flowed in the gun nozzle, where it will be atomized and directed to the desired surface. With this equipment, the coating application can be done quickly and continuously.
For use on a small scale, the cup gun can be used with the proper schedule. The proper amount of mixing is needed to reduce the risk of material waste.
This coating also requires a relatively long drying time; a dust-free room is necessary to place the wet coat product.
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