Body putty for seams

Hi guys. Hope yall are enjoying the summer.
I have been cleaning up the trunk of my 63 Dart converbible so I can paint it and in doing so found that the body putty that seams the seams was contaminated by some oil or something and would pop up in chunks.
This is the stuff that seals the cracks and seams and not body filler so I am trying to find what it is and where I can find it.
Anyone have some help on that stuff?
Also should I paint first then the putty or putty first then paint?
Thanks yall.
John
Author: admin