i purchased an entire set of rubber floor mats for my 81 burb. I’m a pretty handy guy but these are kicking my rear end. I cleaned and covered the floor with sound mat and now I’m trying to install the flooring. I let them sit for over a month on the hydronic heated floor in my shop but the are still really stiff and the wrinkles are very difficult or impossible to get out. The molding is very crude and barely matches the floor pans. I started with the front which is the hardest . Any suggestions? I’m trying to use my heat gun which is helping but it seems to simply go back to its original non-matching shape when it cools. I’ve got it kinda close and have weighted it down and think I’ll put a heater on it for a couple of hours or something. Any suggestion or words of wisdom will be appreciated.