How to Apply Polyurethane Without Bubbles

how to apply polyurethane without bubbles

If you have been wondering how to apply polyurethane without bubble-filled edges, then you have come to the right place. Here are some tips to help you achieve the finish you are after. Before you start, make sure to prepare your surface. You should use mineral spirits, which is a solvent-based cleaning solution that will evaporate almost immediately. Once the surface is clean, dry it thoroughly before applying polyurethane. You may also want to use Shellac to seal a surface. This will prevent bubbles and bleeding while sealing contaminants.


There are a few techniques for applying polyurethane without bubbles. When you apply a coating on a flat surface, you’ll find that it self-levels more easily and drips less. If you’re applying polyurethane on a vertical surface, however, you’ll see drips and runny areas. To minimize these, apply a thin coat or use a wipe-on or spray-on polyurethane. If you still experience drips and buildup, you can use a razor blade or sandpaper to feather in the surface.

Using a foam brush to apply polyurethane is one way to avoid bubbles. Many people mistakenly shake their cans instead of stirring it. Other reasons for bubbles include using the wrong type of applicator or having a foreign object get stuck in the polyurethane while drying. The good news is that most bubbles will disappear after 5 minutes. If the bubbles are large and persistent, however, they may remain. If you don’t pop them right away, you may have to sand the polyurethane down and start all over.


If you want to finish your project without any bubbles, you must follow these steps. You must begin by stirring the polyurethane and pouring it into a separate container. After that, you should mix mineral spirits into it. You should also use a brush to apply the polyurethane. Use gentle strokes and only use one-half inch to apply the coating. Once you’ve applied enough polyurethane, let it dry for a few minutes before attempting a second coat.

Before you start applying polyurethane, you must prepare the surface with the proper tools. Make sure to use a quality brush and rags. Avoid cheapo brushes because they can cause bubbles and ruin your finished product. Then, use the right tools and follow the instructions carefully. Whether you’re using oil-based or water-based polyurethane, the right tools are key to a good outcome.


When applying polyurethane, choosing the right brush is essential to achieving a professional finish. A good poly brush should not only be durable, but also efficient in application. It should also be able to provide a high-quality finish that doesn’t leave any bubbles. Choosing a quality brush is an important aspect of polyurethane painting and will save you time and money. Fortunately, there are several types of brushes on the market. Consider the quality, size, and purpose of the brush before purchasing. Quality brushes will provide a smooth finish and make your work more interesting.

A top quality brush should have a dense, yet flexible bristle. These bristles will ensure that you apply a smooth finish and avoid bubbles. The brush itself should be made of high-quality materials, such as hardwood. Brushes with internal chisel formulation will last for years. They should be made from top-grade materials to prevent any damage or wear. You can purchase a two-in-one brush from Pro Grade to achieve the best results.

Natural bristle brush

There are several benefits to using a natural bristle brush for applying polyurethaner. These include the smooth finish, fewer bubbles, and minimal mess. The Orel brand has one of the best applications for this type of finish. Their lightweight, durable bristles are ideal for applying polyurethane on wood projects. And they’re the perfect size for smaller projects.

Before applying polyurethane, you’ll want to moisturize your brush. Brushes with dry bristles can leave marks on your surface. Likewise, you’ll want to choose a brush that’s made of synthetic fibers. Mineral spirits and water are good for different types of polyurethane. If you’re working with an oil-based polyurethane, you’ll want to use a brush with mineral spirits.

Spray gun

Before applying polyurethane to the surface, make sure the area is clean and free of debris. If necessary, thin the polyurethane with a suitable spraying tool. If bubbles are a problem, thin the polyurethane further by adding water or denatured alcohol. To achieve the desired finish without bubbles, use a spray gun with an appropriate setting. It should be held a few inches away from the surface.

Using a spray gun allows you to easily apply polyurethane without bubbles. Its fine mist can easily penetrate the wood surface without leaving bubbles or dust. Water-based polyurethanes will dry more quickly than oil-based ones. Use a cloth to wipe down the surface before applying the polyurethane coating. Once the polyurethane is applied, wait at least four hours before wiping it with 320-grit sandpaper.