67-69 Cuda repro bumpers any good?

I have re-chromed bumpers on my car both front and rear were done by Bumper Boyz about 20 years ago but what I did was sprayed clear on the back side before I installed them that seems to keep them from starting to rust again and the chrome from flaking off I also but little pieces of inner tube between bumper and the brackets i don't know if thats it or not but if you do nothing to protect the back I think you will have problems after a while. I hope this helps answer your question.