Unless I am doing some serious long lining I just use a Trilene knot, I believe Rapala claims it also. Just a good ole' fashioned Palomar knot but bring the tag end back through the second eye created after you take it through the first. Takes next to know time and you can still do it in the dark if you want to. Also a fan of the turtle knot (or am I thinking of a surgeon's loop, double the line, two loops; I mix these names up, I just tie them anymore anyway) if I want to leave a loop for added action. You sacrifice that little bit of give you might get from the Cinch knot (if I am thinking of the right knot) and it eats up a bit more tippet, especially if you are switching flies often but, you don't have to worry about it coming untied. If you want to stick with the Cinch knot, try some flexament if you have the time to let it set up. Same kind of effect as blue loc-tite over red, won't completely fuse the wraps together like super glue or zap-a-gap.