I highlighted the corners of the ceiling with a light color and this device helped me a lot. I made a 1.5" spacer out of wood (and felt it slides better) and I run the tape applicator pushing the spacer. It works great. I would give 5 stars if they wrapped the roll of tape in plastic. What was that? Are you saving on plastic? It is difficult to grasp the applicator without accidentally squeezing the roll of tape and preventing it from flowing. Getting started is also a bit fiddly. I'm using Frog's tape and you'll need to apply a reasonable amount of starter tape. against the wall before pushing the applicator, otherwise the starting tab will just slip out of the wall.
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