No. But that still leaves certain problems. The high quality backing is not flimsy paper but a vinyl material, hence hypothetically capable of outgassing. Second, any velour like that is going to trap particulates difficult to remove without excessive air-blasting. The sprayed-on "papilli" inside certain especially pricey Hassle-bads was problematic enough.
The problem with some of these newer ultra-black coating options specifically under question is that I simply don't know enough about them. Cameras undergo repetitive internal shocks and vibrations of different frequencies. And out in the field, they also tend to experience serious swings in heat, humidity, etc, impacting expansion/contraction characteristics, both in the short term and long run. How much of this has been actually tested for in actual camera usage? I wouldn't want my gear being the first guinea pig. If it were a something I really needed to do, I'd ask one of my younger friends getting an advanced degree in Materials Science at nearly UC Berkeley, to see if they know of any comparable testing.
And the mention of anything water-based ... what is the binder or vehicle? Most water-based coatings come out somewhat electrostatic due to acrylic binders, attracting random particles of dust and so forth. That's not good either. One more thing I'd want to deeply research first. I takes a lot of work just to find a fast-drying, quickly-outgassing black darkroom paint that isn't electrostatic. You need to know the specific formulation, not just the marketing category.
