sweetideas - so far i have not had any melting issues with branches, ribbons, roses, other flowers, or plaques that i have made with the clay.
because i use smbc as my base, i apply my chocolate to a fridged cake. and usually, i stick the cake back into the fridge after i decorate (i don't put my roses in the fridge though unless they are totally dry...and i usually prefer them not totally dry). i bring to room temp is a cool room. but i have had the cakes in warm rooms after they come to temp and the chocolate is fine.
when i make roses and branches, i usually air dry them for a bit before putting them on and this dries them a bit (just like it would fondant) and they become even more durable. i have never had anything go "floppy" on me, lol.
it's a pretty stable medium to work with despite its melty origins