I used Thermo Tech on mine and was very happy with it. It is easy to use and I had it right next to the headers and it never had any problem. I used it in the transmission tunnel, on the firewall, and on all brake and fuel lines that were anywhere near a heat source. When it got dirty I just used a damp rag and wiped it off. It is kind of expensive but was worth it to me as I put it on in 1997 and it is still there and working as well as ever. If you want to check it out here is the link to their website.
https://www.thermotec.com/
Ron