Gordon Zola! That's a shocker Gary. I've done both back arches on both my Cruisers and that's worse than the lot put together. Entirely fixable of course. But Arrrggghhh!
Jon fitted one on the spare wheel carrier. I have a cover so moved it and out in a 2nd one too from the supplier he originally used. Very nice and bright.
I'm afraid you'll be disappointed Gary. This is vibration isolation and it is stage one of atleast two stages to sound proof your vehicle or details of it like in your case. Silent Coat vibration isolation is made out of butyl. It is eather 4mm or 2mm thick. I put 4mm on the floor and 2mm in the vertical places such as doors. The reason to go 2mm . on the doors is because the butyl sheets are very heavy. The weight of my isolation is about 45kg.+ other materials on top. I use 10mm foam type waterproof sound isolation in 85% of the truck and in some places eather 6mm or 20mm in the back. However the job you've done is a good start. The idea of soundproof is to go layers of different materials. Different material covers different frequency.
P.s.The photos are from the two trucks I've done recently. Just to illustrate the different materials I've used.
Oh well... Its a start, right? Got to say though it does make a big difference already - and let's face it an 80 Series with 3" straight through exhaust and 19 years of use plus chunky tyres is never going to be totally silent inside as in the executive class. But it's less reverby than it was and that's a good thing
Could do with some of that sort of underfelt though - the poor old carpet's backing is pretty much history
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