How to Patch Damaged or Rotten Wood

You can often repair damaged, nonstructural wood—such as molding, siding, or trim—on your home by filling the damaged area with automotive body filler. Here’s how.

How to repair damaged wood:

  1. Dig out any rotten wood.
  2. Mix up two-part automotive filler.
  3. Fill the void with the filler.
  4. As the filler starts to cure, shape it to conform to the molding.
  5. After the filler hardens, sand it smooth with the surface.

Watch this video to find out more.

Further Information

Danny Lipford: When you’re dealing with damaged woodwork, the question that always follows is, “Do I repair it or do I replace it?”

The answer can be found in the purpose of the damaged component. If its function is purely aesthetic—like molding, trim, or siding—then it can often be patched.

Automobile body filler is a great choice because this two-part compound dries very hard, very quickly, so you can fill voids and make repairs very easily.

Once it’s dry, it can be sanded just like wood to create a smooth, finished surface.


  1. Thanks so much, most places only tell you to replace, but it’s solid wood molding that was scratched up by an animal and it seemed silly to replace. So glad I found this article.


Please enter your comment!
Please enter your name here