I prefer woolies as my telltale material of choice. It just settles down and flows better than the nylon strips (these get creases in them and thus always end up flapping constantly).

Woolies usually don't stick if dry. SailKote or similar products can be applied to the wool & surrounding sail area to reduce/prevent wet sticking.

One of the best tips from Rick's book is to place the port tales a few inches above the starboard tales...that way you can easily know which side is out of trim, even when you can't see the colours (if different) clearly (like at dusk or when your glasses fog up).

We needed this setup during our last race on Afterburner (52 ft beachcat)...as the sun went down it became very hard to see which telltale was out of trim, even using flash lights!