I did a bit of work on my boat. U used a foam that I purchased in the UK that does not have a lead layer in it. It does what it says on the tin, which is attenuate. It has a reflective tin layer that helps keep the heat in the engine
room as well.
In my application it was not a full refit
, just a patch up job and the result is not perfect, but I think it is more to do with the holes in the seals
and corners than with the material in itself. In any case, it is significantly quiter than before. I just looked at a bit of leftover to see the brand but I can't find it. I think you may find this stuff either in Phuket or Singapore
, but usually they are better at shipping
in the UK or USA. Hope it helps.