That's a good question.
You can usually help yourself if you hit the "search" button on your topic of interest to see if previous discussions have already taken place. Then you don't have to wait around for people to answer.
Here is a previous thread that seems to fit your question. I found it doing a search on "applying bondo".
http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=4;t=003164#000006
It should get you started until some other people can address your question.
