Polyurethane is a resin that is based on plastic. It is used to manufacture a wide variety of things such as baby toys and furniture. When used as paint, it can be applied to almost all kinds of surfaces such as wood, plastic or metal. This leaves a glossy finish, which is resistant to water and chemicals. It can be available as clear topcoat or in many varying colors. These are usually applied with spray gun or can. So, how do you spray polyurethane?
Consider what type of polyurethane to choose. Most shops sell polyurethane paints that are already pre-mixed and ready to use. These are contained in spray cans. There are also types fit for larger projects that can be achieved by mixing onto finishes.
Setup your area. Your area should be well-ventilated. This is to ensure that you will not be suffocated while working with polyurethane, as it has very strong smell. Make sure also that you will setup your spraying area where there are no people nearby. Lay down newspapers, dropcloth or any material that can cover a wide area where you are going to spray. Thus is to ensure that the floor or grass will not be sprayed also. You can also place whatever you will spray inside a box, allowing you to spray evenly. This will also prevent you from overspraying.
Protect yourself. Cover your face and nose with a mask so that you will not inhale the fumes while spraying. Use a canister-style respirator if possible, since ordinary masks may not be able to filter out the fumes. Wear proper suits and gloves to prevent from skin contact with the polyurethane. Also, protect your eyes with protective goggles to prevent eye strain and irritation. It is also very important not to place the paint near a flame since these are highly combustible.
Spray on your project. It is best to do several thin coatings rather than one or two thick ones in spraying a project using polyurethane. Hold out the spray 10 to 12 inches from your project and spray one light coat that is spread evenly. You can start from the outside surface, and then you can spray horizontally across, from top to bottom. You have to stroke evenly and spray continually. Apply a second coating when the first coating already dries up. Be sure to sand before each coating. This will ensure that your project will finish shiny and glossy. You may need to coat the project with polyurethane according to how much coating is needed. Allow the project to dry completely (at least one whole day), after the last coating, to avoid any smudge on the project.
Spraying polyurethane onto your furniture, ceramics, or any other material, can help save you the money for buying new furniture or ceramics, since polyurethane protects the surfaces. You can also give the projects away or sell these in garage sales if you really want to get rid of them. There will surely be someone who is interested in them since you have given them the glossy finish that only polyurethane can give.