RAAMmat Sound Deadening Melting Failure
In the submitted example shown, RAAMmat appears to display clear butyl melting and dripping. This is a straightforward visible failure, with the material breaking down and leaving behind a nasty mess on the panel.
Based on both the photo shown here and the many complaints that surfaced during the later years of the brand’s popularity, the most likely cause is a poor butyl formula. From what I remember, RAAMmat also used to be associated with a viscoelastic layer that contained asphalt, which would only add to the concern here.
Functional failure was absolutely happening before the visible failure became this obvious. Once a CLD is melting and dripping like this, it had already stopped behaving like a stable viscoelastic damping layer long before the mess made it easy to see.
This type of failure was reported by many users on various forums before the brand eventually shut down.