One of the favorite materials used for wood finishing and floor finishing is the Polyurethane. This is used as a shielded coating for some projects like wooden projects. The reason for using this material for wooden and floor finishing is it provides high durability and hard gloss for the surface. Another reason for using this is the paints made with polyurethane can be applied to any surface.
One of the general questions arises to many users while using this material for painting is how to spray Polyurethane? In general, there are various kinds of this material available in the market. Based on the formulation of this compound and some other factors spraying polyurethane varies. As it is available in different types, spraying this material also differs. The forecast use and the size of the project fix the best method of application and form of finish.
Spraying this material depends on the surface for which it is used for, the formulation used with its water or spills, exposure of the sunlight etc. Based on these the uses of polyurethane also change. It serves as a good heat resistant which makes it as a good kitchen furniture coat. Another question related to this spraying is whether it can be sprayed perfectly or not. It is a coating material which is normally used to protect wooden surfaces. Once used it offers a number of benefits to the user and that’s the reason why most of the people consider polyurethane for their wooden coating.
Before going to apply polyurethane for the surface and know how to spray this material, first we have to decide which type polyurethane is best, water based or oil based? Both type of polyurethane are best in its own way and exhibit different qualities. Both models are highly durable and offer good look to the surface, but there are some differences between them. You have to choose the right one for your project
After spraying, the water-based polyurethanes need two or three touchups. That is after drying you need to give another coat to the surface in order to achieve a good finish. But, oil-based polyurethanes are best in this aspect. It gives a good glow and looks to the surface on its first coat and it does not require any additional coats. Fewer coats are enough in the case of oil-based polyurethanes.
The water-based polyurethanes has only 30 to 35 solid percent of solids, whereas the oil-based polyurethanes contains 45 percent to 50 solids. Therefore, water-based polyurethanes need extra coats when as it includes small solid percent. This is because these solids are the factors that give an excellent protective finish.
Following are the tools and materials needed for this project
Before going to start your spray you need necessary tools. This will help you to avoid frustration at the time of painting and it will save your time to a greater extent. The tools needed for spraying this polyurethane are
In the case of polyurethanes based on oil, you need a brush with a fine bristle and a foam brush and clean cloth.
Like the tools you also need to make arrangements for you materials also. The following materials are required
So far we have seen about polyurethanes, its type and which one is better water-based one or oil based one. Now we are moving into the spray. Let us see how to spray polyurethane paint. This step by step guide will be very useful for you if you are in need of spraying polyurethane paint for your wooden painting project or any other surface painting project. Follow the below given steps
The first and foremost step you need to do is to set up your work area. Make arrangements for the area on which you are going to work. You have to concentrate on your working area whether it is clean or not. A clean working area is needed for spraying this material. Also, keep all the things required at the time of spraying nearer to you but not so most adjacent. This will be very helpful for you at the time of painting
After setting up the working area, you need to prepare the surface on which you are going to spray your polyurethane paint. Keep the surface area clean and dirt free. If there is any dust or bugs on the surface then you can’t able to get the perfect finish. It is better to clean the surface area with a neat cloth before spraying. This will remove any dust or dirt on the surface and the paint will sits perfectly on the surface. Keep in mind that a well cleaned surface is must
Before starting your spray, prepare the spraying material correctly. As polyurethanes need thicker coats, you need the help of thinner. But, first spray the paint without using thinner and see the finish. Based on the finish consider whether you need to add thinner or not and then add it.
In order to attain good finish, you have to spray the paint in thinner coats. This is because thinner coats will give a good finish and removes ruins. Between your layers, and the surface. This will provide a surface for the next round of coat. Spray a number of thins coats and this will give the thicker coat that you want to achieve
After successfully spraying your paint, allow it to dry. Let it take some time to dry. Once the surface is dried, clean your surface with water. If you use oil-based polyurethanes it takes quite a much time to dry. Hence, check once the surface is dry or not and then clean the surface.
Yes, it is possible. To get the best finish when spraying polyurethane, you should try to apply a thin coat (as thin as possible). This will mean using smaller fluid nozzles (1-1.4mm) or air assist airless nozzle sizes and making a swifter pass over the product surface. A thin coat will help to reduce or eliminate issues such as runs in the finish.
In between different coats of polyurethane, you should sand (with about a 220 Grit sandpaper) to provide a better surface for the next coat. You will build your desired thickness by spraying multiple thin coats.
If you want to use a water-based polyurethane, first raise the grain then sand it down before you apply the first coat of polyurethane. This will prevent raised grain which can produce an ugly surface. You should also be careful and avoid applying too many coats; the recommended number of polyurethane coats is four.
Your technique will also have an impact on the quality of the surface you get. If you want to use a spray gun, hold it closer to the surface; if you use an air assist airless, hold it further from the surface. Polyurethanes are usually slower drying coats when compared to other finishes. The additional time needed for it to dry will require you to keep the product away from other products and dust.
By considering your application technique, equipment, characteristics of your polyurethane, and where you spray, you can rest assured that you will apply your coat in an efficient way and look better.
Switching to water-based polyurethane from solvent one has some benefits, mainly reduced fire hazard and odor, as well as minimal effect to the environment. However, the switch can be hard because it’s harder to apply water-based polyurethane.
It is true that pulling the release on the gun and covering the area while moving the gun is pretty the same, but there are some notable differences that can result in problems that can discourage the switch.
You might experience some issues. Don’t worry we have solved them below.
On the whole, if you want to achieve a perfect polyurethane finish for your surface, you have to concentrate on all the factors mentioned above. Starting from the type of polyurethane to the surface area you need to focus each and everything. Then only you will be able to attain the productivity of your painting project. Thus, clearly arrange all the needed things, make your spray, pat it dry, recoat it, and finally clean your surface and enjoy it.