Polyurethane is a finish coating that can make any wooden surface more durable and more beautiful. It is a protectant and sealer. It keeps moisture from damaging the wood. It is also a finish coat that brings an immaculate shine and magnifies the beauty of everything from flooring to furniture.
Polyurethane is avarnish that is specially formulated so that the resin molecules in it willbond together as it dries. When this bonding happens it causes the varnish tocreate a shield of protection around the wood it is applied to.
When you finish an item with polyurethane then the item is protected against:
Before you can begin to spraypolyurethane you need to decide whether to use a water based poly or an oilbased poly.
Water Based Polyurethane VS Oil-Based Polyurethane
The main considerations between the water or oil-based items will be the durability factor. Oil-based is more durable and will provide a longer lasting finish, but water-based poly is clearer and suitable for all wood types, and colors.
Water-based polyurethane is perfect if:
This type of polyurethane is mixed with acrylicresins. The acrylic resins cause the liquid to appear cloudy or milky in thecan. It will retain the milky appearance as you apply it to the wood, but whenit dries it will be crystal clear.
This type of polyurethane is not as durable andprotecting as the oil based varieties are.
It is available in gloss, semi-gloss, and a satinfinish.
Oil-based polyurethane should be used if:
This is the most durable polyurethane and it providesthe maximum amount of protection to the wood.
You can get this poly in a gloss, satin and asemi-gloss finish.
You can also get a water-based oil-modified polyurethane.
This type of poly is perfect if:
With this type of poly you get the durability andcoloration that you like from the oil based products. You also get the fastdrying times and the easy cleanup that you like in the water based products.
This poly is available in gloss, semi-gloss and satinfinishes.
This type of poly will require at least three coatsbefore it achieves the finish you desire.
Can you spray polyurethane – How to apply
Once you have determined the type of polyurethane that you desire, then you need to decide how you wish to apply this product. You can apply it using a paintbrush or you can apply it using a paint spraying gun.
Using Paint Brush
If you apply poly using a paint brush you will quickly discover that you can seethe small delicate lines that the bristles of your brush make. After you applyeach coat of poly you will have to sand it lightly to remove the brush strokes,dust it completely, and then apply another layer of the product.
You have to use a high-quality brush that has the perfect angle. You also have to develop a feather light touch so that your brush strokes are less noticeable with each poly application.
Manypeople have discovered that the paint sprayer will allow you to apply layers ofpolyurethane without brush strokes. These sprayers also allow you to applylighter coatings of the substance so each layer dries quicker.
How to Spray Polyurethane Paint?
Followthese easy steps and you are sure to get a beautiful finish from your sprayedon polyurethane.
The slightest bit of dust in wet polyurethane can mar the finish.You can apply the poly in your garage, workshop, or you can even pitch a tentand apply the poly inside the tent where dust particles cannot be blown ontoyour finish.
Set Up Your Sprayer
You will want to read the manufacturer’s instructions and followthem closely.
Polyurethane Tips from the Pros
Safety Precautions to take when Applying Polyurethane
Frequently Asked Questions
Is Spray Polyurethane better than brush?
When you use the spray polyurethane you do not have to worry about brush strokes or fibers from the brush being in the finish. You do have to worry about applying the polyurethane so that it is in thin coats that dry quickly and so that you do not see obvious start and stop lines.
How do you apply polyurethane to spray on wood?
You will fill your paint sprayer with your polyurethane and spray a fine mist onto the wooden surface. You must make sure that the wood is lying flat and level when you begin to paint. You must also make sure that you spray in continuous movement so you do not have drips or blobs form.
What type of spray gun is best for polyurethane?
An HVLP gun is the best gun for this procedure. The LVLP gun is basically a gun designed for commercial operations and does not do well with this type of spray paint application process. Be sure to clean your gun thoroughly with mineral spirits after you complete your polyurethane application. Do not let the substance dry on the interior of the gun.
How many coats of water based polyurethane should I use?
It is recommended that you apply at least three coats of this substance. With each subsequent coat the shine will be intensified and the protection will be increased. If you are using the polyurethane on a tabletop or a cabinet top then you might want to apply as many as ten coats.
Polyurethaneis the icing on the cake, so to speak. It creates the durable and beautifulfinish that makes your wood projects look their best. The application processfor polyurethane is time consuming, but the time is well spent and the resultswill make you glad that you took your time and used this product.
Sprayingon polyurethane allows you to create a coating that has no brush strokes andfewer imperfections.