Painting on SMBC, need advice

I’m a semi-retired Baker/decorator. Things change fast in the decorator world! I’ve been seeing lots of flowers painted on bc cakes. They look beautiful and I’m confident in my ability to do it, but what I’m wondering, if I paint beautiful flowers on a middle tier of a 3-tier wedding cake, when I take it to the venue and it sits outside and comes closer to room temperature, do I have to worry about the painting running down the cake as the cake starts to sweat??? Would love some help from anyone that’s got any knowledge in this department! ♥️ TIA!