Bicycle Mechanics - Tape for handlebar tape

In the past I've used a good quality black electrical tape to finish off my handlebar wrap, and I've always been satisfied with the results. However, in the past I didn't live in such a humid and muggy climate. Between the warmth and the humidity, the tape tends to slip a little sometimes.

Anyone else deal with this? Would a cloth based tape work better for me? If so...recommendations?

I tried cord whipping (http://davesbikeblog.blogspot.com/2007/03/cord-whipping-handlebars.html) last summer.

Instead of twine or leather cord, I used black craft lacing (a.k.a bead cord, gimp cord, etc.) from a crafts shop. It takes longer to apply than electrical tape but still looks good a year later. I was afraid that since it's slightly stretchy plastic it might stretch and sag, but that hasn't happened yet. I'll probably have to replace the tape before the cord needs a re-do. Look for the flattened lacing, which looks better and won't roll across the tape while you're applying it.

you can always use electrical tape and then black zip-tie(s) overtop it, that should work in your climate.

http://www.racerstape.com/rtp.html#Surface%20Guard%20Tape

If you're not worried about the color, white medical tape has worked very well for me. It's very resistant to humidity and adds a pristine touch of class to my silver handlebars.

http://www.racerstape.com/rtp.html#Surface%20Guard%20Tape

After looking at the link, I am curious as to how this is going to work as bar tape or bar finishing tape?

A trick with electrical tape, in case you don't already know it, is to pull it taut as you tape the end of the bar tape off but then to leave the last inch or so of electrical tape unstretched as you lay it up. That way the last bit of electrical tape doesn't try to pull back over time and leave you with exposed adhesive.

Have anyone tried using large enough heat shrink tubing? In electronics, it is prefered over stupid electric tape

A trick with electrical tape, in case you don't already know it, is to pull it taut as you tape the end of the bar tape off but then to leave the last inch or so of electrical tape unstretched as you lay it up. That way the last bit of electrical tape doesn't try to pull back over time and leave you with exposed adhesive.
+1. This really helps a lot.

Also: electrical tape varies a lot in the quality of the adhesive. I have gotten a few rolls which were total junk and would fall off anything I stuck them to in a few days. And some which seems to last forever. I wish I could remember the brands of the good vs. bad stuff :(

And one other trick for finishing handlebars: where the bar tape ends, wrap electrical tape UPSIDE down on the bar for about 1.5 inches up to that point (adhesive side up!) Then wrap the bar tape on top, and finish off with another layer of electrical tape. Using upside-down electrical tape underneath can really prolong the life of a bar wrap and prevent it from getting sloppy when it starts to loosen and fray.

I use waxed cotton string to finish my bartape, very satisfied with it. Looks a lot better and lasts longer than tape.

Hockey tape works well,. Also you can use it for an underlayment to keep bartape from slipping, to pad the bars a bit and it keeps cables in place.

These are all terrific comments. I appreciate the words, and I'll re-address my own tape issues. I'll probably start with ensuring I haven't improperly stretched the tape, and after that look at quality and type issues.