For a graduation cake, I'm making a four wheeler (ATV) out of RKT. The forecast is 85 degrees, and my friend doesn't have A/C. She plans to leave the cake sit out and serve the other cakes first. So, I'm trying to determine what will be best for covering the RKT. I know both fondant and modeling chocolate are sensitive to heat. I don't know that I really want to use gumpaste due to the expense (as well as the fast drying time...I'm kind of slow.) Based on your experience, which would work better, I'm thinking fondant?

Anyone....

I don't know for certain, BUT my gut instinct when I read your post was GUMPASTE. Then I realized I had to choose between fondant & modeling paste...LOL...so my answer change to fondant. I buy gumpaste in larger quantities and so it cheaper. Even a 5 lb bucket is cheaper than buying from some kind of hobby store (and you know you'll use it!! It's not like it's a 50lb bucket. )

definitely fondant. Modeling chocolate melts very, very easily.