I am working on an X-Wing cake made from RKT. I need the wings to be stiff and harden....any ideas? They are rolled pretty thing...1/4 inch, maybe a bit more....

Is there some trick I don't know? It seems even after a few days of being left out to dry, they are still soft. TIA for any advice.

brush the outside of them with melted chocolate or royal icing

I wondered about royal icing, but was concerned that it would not set up because of the high butter/fat content of the RKT...I will give it a try. Thanks for responding.

I used royal icing over my RKT and it worked great but my RKT didn't
contain any butter or margarine.

When I want my RKT to harden I don't use margarine and also when I get my shape finished I turn my oven on to the lowest setting (170*). When it hits temp, I turn it off and put the RKT in there on a cookie sheet with the oven door cracked open. I just did this today for the tires on the derby cake. It kind of dehydrates them. I then smear with RI to smooth out and hold everything together better. HTH

I use white chocolate in my RKT... it works great!