I ordered the small roll of chrome reflective foil that I mentioned in post #39. Cut off a piece about 3" square and exposed it to hot air from my heat gun, got the foil up to a bit over 200 degrees F, and there was no distortion, shinking etc. I had previously sprayed my reflectors with Aluminum paint, and installed the bulbs I bought from Mo Brighta. Installed the chrome reflective foil on one side of tail lights in all positions using small overlapping pieces of the foil, then turned on lights, brake lights and flashers. Wow - the side I'd completed looked at least 50% brighter. Promptly did the other side, but haven't driven the car since.
Can't speak to long term durability (it didn't stick real tightly to the reflectors), but it certainly provides superior brightness now.
Gary