Been searching over the internet for an answer to this question and so far haven't found much. The doorknob hole of my door is damaged so that when you put the doorknob in there is a gap that you can see through. I have researched the internet and Bondo seems like a possible solution to fill in the space. Since I am doing this work to an interior door, I am concerned about the fumes and I've never worked with Bondo before. Any suggestions.