The original firewall blanket was old, greasy and didn’t even cover the full firewall.
I did a lot of research on various material to cover the firewall to protect against, heat, flame and sound.
I really liked a material from Aircraft Spruce, but of course it was not FAA approved.
I send a few pieces to a DER for testing and get the test report so now it IS approved on my aircraft.
I cleaned the firewall, cut the material and used 3M V77 adhesive spray to attach it.