Although the Octavia has a decent noise profile from factory, I decided it would be worthwhile attempting to soundproof it a little more. The usual culprits, the boot and rear seat, were first in line. The large metal surfaces in the boot had only some small pieces of deadening material on them from the factory, sounded like a drum when tapped, especially the hump above the gas tanks. Treated them with a layer of CTK Premium 2.2mm butyl mats. I also identified a potential source of rattle under