Thanks for the suggestions, I wanted to go for silver or gold so I decided to try some of this. Wasn’t sure on the Dynamat spec, I couldn’t seem to find a temperature rating listed for it, from memory I think it may be the dynaliner stuff I was looking at.
From general research this stuff seems to fall into 3 categories, no temp rating, 200c and then 1000c, there’s doesn’t appear to be an in between
https://www.carinsulation.co.uk/prod...van-insulation