how to fix bad polyurethane job

how to fix bad polyurethane job

How to Fix a Bad Polyurethane Job

Polyurethane can give the surface of whatever you’re coating a beautifully glossy look – when done correctly. But, when a bad job has been done, an unsightly, dappled finish is all you’re left with. Follow this step-by-step guide to help you get your surfaces looking their best:

Step 1: Assess the Situation

Confirm whether or not you’re dealing with a bad application of the polyurethane or if something else is the actual cause of the problem. It could be due to contaminants in the surface, air bubbles or fading.

Step 2: Remove the Polyurethane

To achieve the best results, you will need to completely remove the problem polyurethane and then start the process again. This can be a difficult and time consuming process – but it’s the only way to do it effectively.

How to remove the polyurethane:

  • Sand the area gently to remove the top layer or layers of the polyurethane. It won’t remove the entire coating, but it’s a great starting point in removing the bad application.
  • Strip the surface using some type of stripping product that is designed for this purpose.
  • You can also use paint stripper that is specifically designed for removing polyurethane.

Step 3: Apply the Polyurethane Again

Start your application over, making sure to use the same type and brand of polyurethane as before. Check any stains or finishes you have used beforehand and lightly sand the surface before you start.

Tips for a Successful Polyurethane Application:

  • Work in thin coats.
  • Prevent bubbles, drips and clumps by using a brush with soft bristles.
  • Allow each coat to dry before applying the next one.
  • Always sand between coats.

Step 4: Inspect

Once you’ve completed applying the polyurethane and it has dried, inspect the surface for a uniform and attractive finish.


Fixing a bad polyurethane job is not an easy task, but with some knowledge and hard work, you can do it. By following the steps above, you can achieve a surface that looks as good as new.


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