I have been waiting for a couple months to finally make a post on here but I think this is something I may have some relevant and reliable input on. Before bringing my 73 up to Pittsburgh (back in August) I used nearly the identical steps as above on my old emblems, and before returning the car and garaging it back in Dallas (December) those emblems underwent moderate snowfall, heavy rain and some pretty serious temperature changes without showing any sign of wear. I highly recommend saving a little $ and getting intimate with your old emblems.