Green glue soundproofing?

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Hi all,

I'm going to stick some soundblock 12.5mm onto existing wall (which is made of square plastic compartments covered with plasterboard)

I'm thinking of using green glue to stick it on, because it cuts down structural transmission of sound.
but when i look at the green glue how to video, they demonstrate putting the glue on, sticking the board up, then screwing it on.

-doesn't screwing it on make a nonsense of acoustic separation?
-has anyone used this stuff, or similar - is it any good?

Thank you, much appreciated, Stephen
 
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