I think there was a thread on this not too long ago, but I was not able to find it through the search.
I was looking for the most secure knots to use with 1-3mm spectra line. Any help would be appreciated.

Try
http://www.backpackinglight.com/cgi-bin/backpackinglight/xdpy/forum_thread/18660/index.html?skip_to_post=144320#144320

The double overhand knot (or thumbknot) does hold and makes a good loop at the end. Most other knots slide.

Cheers

Thanks for the help Roger