I just finished doing two separate 85" screens using some of the last of my Black Velvet ( SY's Triple Plush variety ) and one thing is for certain....under full room illumination the BV easily looks worlds better than the Protostar. Feels so much better to the touch as well.
I'm going to reserve a final judgment until I actually do a Screen's Trim with the Protostar.....but in a side-by-side comparison under intense light, it seems the only thing the Black Velvet falls short on is not having a total lack of "sheen".
However in a great many previous uses, I've never be able to see the "projected" illumination of any light spill onto the Black Velvet , be it from a image or the PJ's start-up screen.
All that being said, as a "Sticky" the Protostar is still a quantum leap beyond any previously mentioned adhesive backed Black Felt or suedo-Black Velvet as far as having a lack of reflectivity. But is it a viable alternative to actual Black Velvet in the making of actual Screen Trim? Can't say that...yet, because to me, a classy appearance both in the dark and full room lighting is crucial, and as of now....the difference under bright light still shows the Protostar to resemble a Black Felt more than a luxurious "Black" that Black Velvet presents, and the Black Velvet does it all (light absorbing and great looks ) exceptionally well.
Add to that the fact the Black Velvet cost just $6.99 yd for a 52" x 36" section and that for the $75.00 (less shipping) the Protostar costs for 30" x 200", for the same amount (length) of Black Velvet it would cost just $45.00 w/shipping and you'd get over an extra 1-1/2 feet of width as well.
I will however say at this conjecture that no matter what...if stapling or gluing Black Velvet Cloth is not desirable, then the Protostar is the best choice of all the "Stickys"...price not withstanding.
Here is a image of a Screen just done in Black Velvet Trim. Later today while present, I'll do a close up comparison between the ProtoStar and this particular Screen's trim, shoot a few images, and post 'em up.