Like I said, it's quite likely that, when using CA, some will likely be drawn or bleed in along the very edge of the liners. I had this happen, but it wasn't nearly as bad as having it left completely open. The worst it got was a tiny bit of the masking tape was glued around the very perimeter of the liners, which, was much easier to remove that big uneven patches of CA.

Of course, you don't want to just put a pool of CA around the scales or else you'll have ton that will need to be sanded off, and could potentially break off catastrophically. If there's too much lieing around the edges, just use a piece of tissue of q-tip to wipe it up. Since CA has such a low viscocity, it will draw up into a napkin rapidly and fairly cleanly.... Just don't wipe your mouth with it afterwards Also, masking tape is dirt cheap, so if it gets a little to haggard, it's really easy to just make a new jig.

I should mentioned that I haven't used this jig on a whole lot of CA finished scales as of yet; just because I haven't been using CA as much in general as of late. Once I learn more, I'll definitely post any more tips I acquire along the way.