If you use dental floss, double it up.

Many people have used floss over the years, but I think it's expensive, and not as strong as other types of thread.

I used Cabela's Prestige 50lb test braided Dacron fishing line. The only thing I don't like about it is the green flecking through the white line. (In truth, it's not bad if you are coloring your coating.) I've probably got 3-5 more boats out of this 200 yard roll. Not bad for $12.99. Could probably even use 30lb test. (Wow, what a freakin' URL. I hope it's usable...)

http://www.cabelas.com/product/Fishing/Fishing-Line/Super-Lines|/pc/104793480/c/104719680/sc/104612580/2008-Cabelas-Prestige-Braided-Dacron174-Line-200-yds/741178.uts?destination=%2Fcatalog%2Fbrowse%2Ffishing-fishing-line-super-lines%2Fcabelas%2F_%2FN-1100386%2B1000002949%2FNe-1000002949%2FNs-CATEGORY_SEQ_104612580%3FWTz_l%3DSBC%253BBRprd741178%253Bcat104719680%26WTz_st%3DGuidedNav%26WTz_stype%3DGNU&WTz_l=SBC%3BBRprd741178%3Bcat104719680%3Bcat104612580

Brian

: I'm ready to start skinning my wife's Chuckanut but it just dawned
: on me that I haven't procured any thread for sewing. What do
: most guys use?