I'm currently putting together my DIY screen. I bought a roll of PSM DeepBlack (DeepBlack Border Tape - PSM - Projector Screen Material border tape on a whim, and thought I'd compare it to a cheap roll of sticky-back black felt. I'm making my borders out of 7cm wide acrylic that I'm wrapping with the tape/felt. I used the sticky-back felt first, and was initially happy enough, and thought about returning the tape because it's pretty expensive (£40 for 10m of the 10cm wide tape. 5cm wide tape is £20). However, this evening I thought I'd give it a go as I just felt my felt border (heh) didn't have the clean edges I was hoping for. The felt was a pain to use as it was stretchy and thus I found it a bit tricky getting a smooth finish. The DeepBlack tape on the other hand was fantastic - it laid flat without stretching, and I could pull up and reposition the tape without any issues (no chance with the felt - once it's stuck, it's stuck!) The real test was under bright lights - I used lamps as my projector's not up and running 'til the screens made. The felt (which cost £30 for 5mx45cm) reflected light quite a bit, but the DeepBlack stayed true to its name. Really pleased with the finish, and the edges are so much cleaner. I'd definitely recommend it to anyone looking to get a really black border on their DIY screen. Anyway, some (crappy phone) pics below for comparison.