So now I try to learn something again The background is – my BOSE system in S202 still sounds good enough for me, but the panels become old and rattled. To fix this permanently, I now have some time and want in this – the door panels in front, as far as possible (are partly hollow waxed, there is nothing more) – the door panels in front, where not relevant for airbag – the side panel in the back, where the small sub sits on the wheel box – the panels around the Su b rum – the sub itself (is only plastic) – the door loudspeaker bass reflex housings clean. I still have some bitumen from the Audi, but would like to install that at most on the rear side of the trunk; at least not in the doors and also not on the sub (the forming is not easy to make). Moreover, it is not enough anyway. In terms of alubutyl, however, I am still unimaginably clueless. What distinguishes for example the already recommendedhttps://www.just-sound.de/…/ from the cheaper (per m2 and from the processing)https://www.just-sound.de/…/ ? How do I recognize what data is important here? Because the total thickness and the aluminium content are identical here. Not that I would buy Reckhorn now (which is certainly better than nothing), but I want to understand it already thanks!