lizard skin heat, sound, or both?

[grandpas66]

I am about to spray lizard skin on my interior. I will be a nice ,modified truck but not a show truck. I am looking at the sound coating, the heat coating or both. It is a bit pricey. I have looked at some of the DIY options and elected to go with the commercial option. My floor pans have a rubber rust casing already on them and they are significantly quite than the panels with out it. I won't be spraying the ceiling/roof. I will probably use a Matt deadener in the doors because it is easier to apply.
Does anyone know how much sound the heat coat reduces? I am sure it will reduce some. Is it worth doing two layers on top of each other or is this simply overkill? Thanks in advance.

[mongocanfly]

https://m.youtube.com/watch?v=3sOXUQiiJAM

[grandpas66]

Thanks, that is a dramatic difference. I wonder how much difference only adding the heat coat would make in keeping it quiet. Have you seen anything about that? I have looked for some time and I can’t find any one who has only tried one of the coats

[mongocanfly]

I used the sound deadner on mine and it passed the rati-tat-tat test...not on the road the though...