They can require a bit of patience. I echo the sentiments to try misting longer, maybe get an automated system (e.g. site sponsors MistKing or HerpMist), which will provide a reliable steady misting without your having to stand there thirty minutes.
Our routine: I start spritzing Thaxter (panther) with lukewarm water. He immediately walks away. I do not chase him, but continue spritzing where he was. After one or two minutes, one or two neurons fire in his brain: "You know, that just may have been water! Maybe I can drink it!" He turns around and walks back into the spray. I continue spritzing. He thinks about it. After another minute or two, he tentatively opens his mouth and extends his tongue just a bit. In another minute, he starts drinking with gusto, sometimes shooting a particularly attractive drop, sometimes licking leaves repeatedly. He will continue this until I empty the spritzer, and keep licking leaves for up to an additional twenty minutes.
He also has a dripper set up to drip throughout the day; he will drink from that, but often prefers the spritzing.
Occasionally he gets so caught up in the excitement that he forgets to swallow, and the water drips back out the other side of his mouth. You do sometimes wonder how these things ever make it in nature, especially since Madagascar has a dry season.