Here is my advice on the application of the badges. Both the back of the badge as well as the surface of the pent-roof cover need to be real clean for any epoxy to adhere over the long haul. I would suggest a clean rag wetted with acetone. Acetone is a super cleaner and leaves no residue. Second choice would be brake cleaner fluid if you do not have Acetone. Be aware that acetone is a very very flamable fluid so it is not advisable to leave that rag crumpled up, let it air dry outdoors after you are done.
Now, for the epoxy... there is a super epoxy that is two part, and a paste called PC7. One part is black and the other is grey. You mix these in equal parts. Because it is a paste or putty, you can easily put 5 dabs on the back of the emblem and the emblem will kind of "bed" to the top of the pent-roof. Benefit is not spill or drip, and permanent.
PC7 is super strong, rubbing alcohol is the solvent if you need it. It cures fully in 24 hours and is drillable, tapable, sandable, polishes, molds, inpervious to
oil, does excellent in thermo expansion/contraction, water, etc. This is amazing stuff. Shelf life is very, very long when puchased in the tin cans. It comes also in smaller plastic tubs.
You may have seen this stuff in good hardware stores. The display is ususally a Coke bottle with all sorts of things attached to it. It works. The emblems on my ERA's Pentroof have been there for 10+ years now.
The nagging question about the badges on the pent-roof covers it the so called "Correct" position. I have seen both in front as well as one in front and one in the rear location (side to side) on original 427 photos. I have also seen both in the rear as well. It appears there was no "rule" or standard for badge placement based on those observations.
Does anyone have the "definative" answer to placement?
Cheers