If you have oil or grease stains on your wood deck, you may be tempted to use a water-based polyurethane over them. However, before you do this, it is important to understand the difference between these two types of stain repellents. Water-based polyurethanes are designed to dissolve oil and grease molecules in water.

This means that they will work well on oil and grease stains that are only a few layers deep. However, if the stain is more than a few layers deep, then the water-based polyurethane will not be able to reach the deeper layers and the stain will remain unchanged. Oily stains, on the other hand, are composed of larger oil droplets that can resist absorption by a water-based polyurethane.

In fact, if you try to treat an oily stain with a water-based polyurethane, it may actually make the stain worse because the detergent action will break down the oil into smaller droplets that will continue to spread throughout the wood. To successfully remove an oil or grease Stain from wood Decking, it is best to use an organic cleaner such as vinegar or lemon juice. Then follow up with a coat of a dry Polyurethane sealer such as Tung Oil Free Wood Sealer.

Use Water Based Poly Over Oil Stain

Source: woodworkingclarity

Can You Use Water Based Poly Over Oil Stain

Water-based polyurethane is a great product to use when trying to remove oil stains from carpets and upholstery. First, you will want to test the colorfastness of the polyurethane by applying it to an inconspicuous area.

Next, clean up the area where the stain exists using water and soap. After cleaning up the area, apply a coat of polyurethane foam to the stain and allow it to cure for several hours. Finally, dry the area off and you should be good to go.

Test For Colorfastness

Test for colorfastness before using a water-based polyurethane over oil stain to determine if the product will work. Mineral spirits, kerosene, and other petroleum products can darken a water-based polyurethane.

Soak a cotton swab in the solution and rub it onto the affected area. If the color change is minimal or not at all, then the product should be fine for use on oil stains. But if there is significant discoloration, then professional help may be necessary to remove the stain completely.

Once you have chosen a water-based polyurethane to use on oil stains, follow instructions carefully to avoid any damage. Always test an inconspicuous area first before applying to an entire oil stained surface. Be sure to wait until the product has dried completely before touching or moving any furniture or objects that were covered in the product.

Keep children and pets away from treated areas until the finish has time to dry completely; otherwise they could get hurt or into something dangerous while it is drying.

(If your pet accidentally gets into something treated with a water-based polyurethane, rinse them off thoroughly and call your veterinarian.) Remember that water-based polyurethanes are not permanent – they will eventually wear away as soil reacts with them and sunlight attacks the material.

Clean Up The Area

If you have an oil stain on your wood floor, the best way to clean it up is with a water-based polyurethane. Follow these steps to apply the cleaner: Wet the area of the stain with warm water.

Dip a cloth into the polyurethane solution and wring out the excess. Apply the cloth to the stain, using pressure and working in circular motions. Let the Polyurethane dry for minutes before wiping off any excess with a clean cloth or towel.

Repeat this process if necessary until the surface looks clean and free from streaks or residue. If you have multiple spots or areas that need attention, mix together a smaller amount of Polyurethane cleaner and pour it over the affected area(s).

Wring out the cloth as you would with step above, then blotting away any excess liquid until only a light coating remains on the surface. Let dry for minutes before wiping clean with a dry cloth or towel; repeat as necessary until all areas are treated.

Apply Polyurethane Foam

When trying to remove oil or water based polyurethane from a surface, it is important to first neutralize the area with baking soda and water. Apply a thin layer of liquid polyurethane foam over the stain and work into the fabric with a scrub brush.

Wipe away any excess polyurethane foam with a clean cloth and allow the area to dry completely before moving on to the next step. If you notice that areas are not coming off as easily as others, repeat steps until all areas have been treated. Always test an inconspicuous area before applying polyurethane foam to a larger area in order to avoid damaging your furniture or other items in the room.

Onceoil or water based polyurethane has been removed, rinse the surface with cold water and dry thoroughly before painting or applying wallcoverings. Polyurethane foam can be used on most surfaces including painted walls, wood floors, and cabinets.

Follow all instructions carefully when using this product; if done incorrectly, it may result in damage not only to the surface but also to your clothes and skin! For best results, use liquid polyurethane foam on unfinished wood before finishing it with a finish of your choice such as varnish or lacquer.

Allow To Cure

If the water-based polyurethane is not dry to the touch within hours, it is not completely cured and you may need to apply a second coat of polyurethane. Apply a coat of polyurethane to a clean, dry surface.

Let the polyurethane cure for at least hours. Clean any excess polyurethane with acetone or lacquer thinner before it cures. If the polyurethane begins to peel or chip, sand it down until it is level and smooth again.

Allow the polyurethane to fully cure before applying another coat of polyurethane, if desired.

Types Of Polyurethane

Water-based polyurethane is a popular type of polyurethane because it is oil and water resistant. It can be used on wood, masonry, and other surfaces that may have an oil or grease stain.

To use water-based polyurethane, first make sure the surface is clean and free from any oils or grease.apply a coat of water-based polyurethane to the stained area, allowing it to dry thoroughly before applying a second coat if necessary.

For best results, apply two coats of polyurethane when using this type of product. Once the polyurethane has dried, you may need to sand down the area to remove any roughness or bumps caused by the staining process. Finally, seal the surface with a finish such as varnish or paint to protect it from further damage.

How To Remove Oil Stain With Polyurethane

Polyurethane is an excellent product to use when trying to remove oil stain from concrete, wood, or other surfaces. When using polyurethane, be sure to test a small area first to make sure the product will work on the surface you are trying to clean.

Once you have chosen a polyurethane product, apply it with a pump-action sprayer. Be patient while waiting for the polyurethane to work; sometimes it can take up to several hours for the oil stain to disappear completely. For stubborn spots, try using a scrub brush and hydrochloric acid diluted in water; this will break down the oil and make it easier to remove.

Finally, rinse the area thoroughly with clear water to remove any remaining polyurethane and oil stain residue. Remember: patience is key when cleaning oil stained surfaces with polyurethane! When working with polyurethane products, be careful not to get it on your skin or clothes; it can be difficult to remove once it has dried. Always read the instructions before using a polyurethane product; some may require special precautions when cleaning oil stained surfaces.

. If all else fails, consider calling a professional cleaner who specializes in removing oil stains from concrete, wood etc.

Preparation For Water Based Polyurethane

When it comes to water based polyurethane, there are a few things you need to do before beginning. Make sure all surfaces are clean and dry – this will help the product adhere better.

Apply a thin coat of the product to the affected area- wait minutes for it to dry before moving on. If the polyurethane has dried too hard, use a hairdryer to soften it up again. Once the polyurethane is softened, use a putty knife or an old credit card to scrape off any excess.

Finish by applying another thin coat of polyurethane and waiting minutes for it to dry again. Now that the surface is completely covered, let the product cure for hours before using furniture or other objects on top of it. For extra protection, you can apply a second coat of polyurethane after hours have passed.

There are many products available on the market today – choose one that suits your needs best! Remember: patience is key when dealing with water based polyurethane.


If you have an oil stain on your concrete that is water based in color then you can try using a water-based polyurethane over the stain. However, it is important to remember that this will not remove the oil stain, but merely cover it up.

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