That thread is two years old OD.
I think this is the thread he read a few weeks ago.
Just a hint here for finding an individual post IF YOU KNOW WHO MADE IT.
Click on his/her username in the upper left corner of any of his posts.
A window will open that has an option to find all posts made by that member.
I recalled making the post with dent removal tip, but didn`t recall which thread it was in.
I just quickly scanned through pages of my posts search before finding the above link at the top of page 4, as shown here: