I have always preferred using a short leader butt of heavy monofilament with a perfection loop, nail-knotted to the fly line for the line-to-leader connection, but in the past, when I built my own steelhead lines, I used braided monofilament loops to connect different types of lines. I always finished the loop installation with a couple of nail knots over the butt of the loop and the fly line. I never felt it was necessary to use any kind of adhesive. The connection was stout enough that the line itself would break before the loop would fail.