Thick applications are more likely to trap solvent or moisture from the oil below, which can cause the finish to bubble or yellow over time. To ensure the polyurethane sticks securely, you must create a mechanical bond or alter the surface tension of the oil stain so the water-based product can grip it effectively.
Testing Oil Stain Dryness for Water Based Polyurethane Application
Conversely, water based polyurethane is formulated to dry through the evaporation of water, creating a film that wants to adhere to porous or slightly rough surfaces. Wipe away all dust with a tack cloth to ensure a clean surface.
Once dry, the real work begins with sanding. When you attempt to glue water onto oil, the bond is weak.
Testing Oil Stain Dryness for Water Based Polyurethane Application
Using a high-quality synthetic brush or a foam applicator helps to minimize bubbles and ensures a smooth, even coat. It is generally recommended to apply thin, multiple coats rather than one thick layer.
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