How Long Does Polyurethane Take to Dry on Wood Furniture? Polyurethane is a type of paint that dries in 24-48 hours and takes about 30 days to fully cure. This process can be sped up by providing adequate ventilation, ensuring the environment isn’t overly humid and using an electric fan or dehumidifier if necessary.
Wood needs protection from different elements, and without the finish, it could become dry and lifeless. The coating on wood increases wood richness and depth and protects from scrapes, weather, and knocks.
What is Polyurethane
Polyurethane is a super-strong varnish. As it dries, it forms microscopic chains of resin molecules bonded strongly together. Therefore, it provides better resistance against water, abrasion, solvent, and is more effective than traditional varnishes.
Polyurethane is used as a finish layer and applied after installing a hardwood floor. Not only does it protect your wooden floor, but it also highlights the natural wood grain. A cured wood sealer provides protection against moisture damage and water to the underlying wood and emphasizes the color or depth.
Before you resume regular activities on your wooden floor, Polyurethane needs to dry and cure for lasting protection. But, how long does polyurethane take to dry on wood furniture? Many factors decide how much time it will take for sealers to cure.
Drying Time vs Cure Time
Humidity, temperature, type of wood, and type of polyurethane sealer determine the duration of drying wood. Usually, polyurethane wood sealer dries between 24 to 48 hours and takes around 30 days to cure.
Types of Polyurethane for Wood Furniture
Basically, you can find two types of Polyurethane, oil-based and water-based. You can make Polyurethane by dissolving a resin compound into a solvent.However, when you apply the sealer on wood where water or oil will evaporate from the polyurethane resin and leaving a plastic-like coating on the wood.
Water-based polyurethane dries quickly; it is odorless and can be clean with water. It will not get yellow with time. After an hour of applying the water-based polyurethane, you can touch the wood and feel if it’s still sticky. Normally it becomes dry after an hour or so.
However, be cautious not to touch the wood or walk on the floor, because it might need sand or recoat after 12 hours. While repeating the process, make sure to apply and clean the sanding.
Water-based Polyurethane will dry after 48 hours, and then you can use your furniture or the wood floor. Polyurethane will take around 30 days to cure, so avoid covering the surface with a rug during this time.
Oil-based is also known as solvent-based, and it is best for use in high traffic or humid areas because of its durability. It also has more resistance to moisture, solvent, and heat compared to the water-based alternative. The only disadvantage with oil-based polyurethane finish is yellowing with time.
If you are planning to apply the oil-based application, you need a high ventilation area. After applying it on the wood furniture, you’ll have to wait for 24 hours, or till the wood feels dry. It takes longer to dry and cure.
However, wait for three to four days to use the furniture or floor to its fullest potential. The varnish will cure after 30 days, so don’t cover the surface during this time.
Factors Affecting Drying and Curing Time of Polyurethane
Mainly, there are two factor:
Type of Wood
There are different wood species, and few of them produce natural oil and chemical substances, which causes delay in drying or curing of Polyurethane. For example, aromatic cedar and rosewood will need more time.
Cold weather always prolongs the process of wetting or drying the wood. High temperature and lower humidity are more favorable for Polyurethane because they will hasten the drying process.
Carefully plan your project according to weather conditions to refinish your wood floor because it might affect the drying time.
Polyurethane can be applied using a foam brush. You need to clear the room, sand the wood, and remove any dust and dirt. You can start your work by choosing one of the best hardwood floor finishes.
Safety first: wear gloves and a respirator mask when you are applying a finish, and follow the manufacturer’s instructions.
Excessive coats may form surface wrinkles on the surface. Too much of Polyurethane also delays the drying process. Therefore, stick to the guidelines and allow sufficient time for the sealer to dry and cure.
How Long Does It Take to Cure?
Oil-based finish cures in two stages.
- At the first stage, thinner evaporates, and finishes become tack-free.
- In the second stage, oxygen combines with varnish and starts the curing process, which will make the finish durable and hard.
This process may take up to 4 weeks depending on:
- Weather conditions
- Number of coats
- Thickness of the film applied
If you can feel the polyurethane odor, even if it is mild, that means it’s still curing.
Polyurethane finishes are available in three different sheens in the market, and each has its own features and different drying time.
This finish is suitable for both interior and exterior. It is a tough and flexible finish that gives a slick and shiny surface. High gloss varnishes usually take a long time to cure and dry.
Semi-gloss is commonly used on furniture, doors, floors, woodwork, and cabinets, and it takes a moderate amount of time to dry and cure.
A satin polyurethane finish gives wood slight shine, subtle gloss, extra color and also provides a durable matte surface. It is very fast in the drying process.
What to Do When the Furniture or Floor is Still Wet
Polyurethane cures, once the molecules react with oxygen, and develops a strong bond between the finish and underlying wood.
If the wood’s surface neither feels sticky nor appears wet, it means the wood sealer is dry. In this situation, you can use the wood furniture or walk barefoot on the wood floor. Avoid placing any heavy item or walking with shoes on the floor until it’s completely dried.
Polyurethane finish provides a beautiful look and offers strong protection to your wood. It would be best if you considered the drying time when choosing Polyurethane for a wood.
Oil-based Polyurethane takes 24 hours to dry whereas water-based Polyurethane requires just 6 hours. These drying times are measured at a specific temperature and humidity level (21 degrees celsius and 70% humidity).
So, the time may vary depending on your specific conditions.