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I would venture to say this is bad
(sh.itjust.works)
This is my 400mm 110v silicone heat made on my bed. Suddenly nothing would stick toy bed any more, regardless of temp, offset, and adhesion assistance agents. I finally looked at the center of the bed was puffy. I was able to slide a ruler in between the aluminum bed and the pad. It took a bit of elbow grease to pull off the edges. Dunno how close to disaster I was but it's a little too close for comfort. It never overheated in all my use and the thermal fuse is still in tact but the scorch mark is still disturbing.
Looks like the glue failed and so heat was building up instead of transferring.
Exactly. I don't know the expected life span of 3m 468mp but apparently I exceeded it in my environment and duty cycle. I'm still working on getting the residue off of the bed however, and I can say that where it stuck, and did not fail, it did an excellent job, even pulling off bits of silicone with the glue.