If you know the right knots its not a problem to get them to hold. I find that braided line holds fine. (Nylon monofilament however doesn't hold well).
Its just a question of pulling tight and doing a decent knot. If you couldn't do a locking knot you'd never catch a big fish on it. Many of these braids hold 70-80% of linear strength knotted.
I've used waxed dental floss on many occasions for tying baits on... I use it in the place of braid because it flattens out around the round bait and holds better than a round section braided line.
Finally the braids I use are nice dull colours... brown, black or green... floss is invariabley white.
cheers
Gareth
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