That 2006 Infinity Q45 changed my whole approach to plastic repair
Had a guy bring in a bumper last winter from a low-speed hit, and I used to tell people heat gun and a push from behind is fine. Tried that on his car and the plastic just crinkled instead of popping back. Now I always check the part number and look up the material grade before touching anything, especially on Nissan stuff from that era. Anyone else run into plastic that refuses to behave no matter what temp you run?
I read somewhere that a lot of those Nissan plastics from the mid 2000s were a talc filled polypropylene and they get brittle with age, so heat just makes it worse instead of helping. Sounds like that bumper was already past the point of no return before you even grabbed the gun. Did the part number tell you the grade right away or did you have to dig for it?