AMaking a super hero cake with Hulk Hand busting out of top....Have formed hand out of Rice Krispy Treats...I was going to cover in melted modeling chocolate to fill in cracks....I will be then applying fondant to finish.....How do I get fondant to stick to modeling chocolate? I have seen a thread but not really specific to this process....Any help would be appreciated!

AI've just used cooled boiled water or simple syrup with no problems in the past.

AThank you so much for your reply! This will be my first time trying this technique!