O.k so this weekend,Sun.I will be attempting to cover a three tiered cake with rhonda's mmf,which I found that I love,I was just wondering how long do you need to let it set up or let the pieces harden before attempting to move it,I will be driving about 25 miles and it has been about 85' here lately.I did a cake last weekend with it and had to leave almost as soon as I was finished putting it on the cake and it slid a little but I might not have had it doweled properly or let it settle long enough,it was also a carved cake.Any tips would be appreciated.Thanks