Factory mounts are made with rubber, not polyurethane.

 

Well anyway it bonds really well, resists heat, worked really well for me. Except for the vibration, but i used some hard urethane, they have diff kinds i heard from my friend that did it... oh well, my car is not really made for comfor anyway, im leanin more toward speed

 

True in regards to naming the material "rubber" which could have polyurethane in the make up of the compound to create the motor mount out of rubber. Polyurethane is used in a lot of rubber products, tires, condoms you name it, it is everywhere. Which makes this a pretty decent fix. The elemements will bond. I should know more, but I fell asleep 1/2 of the yr. in HS chemistry.