Applying polyurethane involves preparing the surface, choosing the right application method for the area, and applying multiple coats with drying time in between.
Preparing the Surface
Before you start applying polyurethane, it's crucial to prepare the wood surface. This step ensures a smooth finish and helps the polyurethane adhere properly.
- Sand the wood: Sanding creates a smooth surface by removing imperfections and opening the wood grain slightly.
- Clean thoroughly: After sanding, be sure to wipe away any remaining dust. A clean surface is essential for a smooth application.
Choosing the Right Application Method
The best way to apply polyurethane depends on the shape and accessibility of the surface you are working on.
Here are the recommended methods based on surface type:
| Surface Type | Recommended Method | Tool |
|---|---|---|
| Flat surfaces | Brushing | Use a brush designed for finishes. |
| Contoured surfaces | Wiping | Use a clean, lint-free rag. |
| Hard-to-reach areas | Spraying | Use an aerosol spray can of polyurethane. |
- Brushing: Ideal for large, flat areas like tabletops or shelves, using a brush allows for good control and even coverage.
- Wiping: For curved legs, spindles, or other intricate shapes, a rag conforms better to the contours, helping to avoid drips and ensuring full coverage.
- Spraying: Aerosol spray is perfect for tight corners, crevices, or detailed carvings that are difficult to reach with a brush or rag.
Applying Multiple Coats
Polyurethane is typically applied in multiple thin coats rather than one thick coat.
- Apply the first coat using the appropriate method.
- Wait for each coat of polyurethane to dry completely before applying the next. Drying times can vary depending on the product, humidity, and temperature, so check the product instructions.
- Applying multiple thin coats builds durability and provides a deeper, richer finish.
By following these steps—proper preparation, selecting the correct application method for different areas, and allowing adequate drying time between coats—you can achieve a smooth and protective polyurethane finish.
