Sound Deadener on roof question

Hyper_pak said

Replacing the headliner and I was thinking about using some on the underside of the roof.
I was thinking about the heat more than sound proofing.
What I am worried about is it coming down in Texas and Arizona heat.
Any thoughts or experiences?
I am using an Amazon product, VEVOR.

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I've had Kilmat on the inside if Vixen's roof for several years now in the Georgia heat and it ain't goin nowhere. The key is, put it on on a HOT day. Lay it all out on the car IN THE SUN and let it get good and HOT. When you stick it, roll it on with the roller tool and it will stick like WHO FLUNG DUNG. It AIN'T comin off. lol