Hi! I am a complete beginner, and I need to have a sculpted cake topper in a car shape for a baby boy cake ready in 48 hours!!!!! Do I use a fondant or sugar paste? How much time should I expect this to dry before it is ready to be placed on a cake? Will sugar paste and 24 hrs to dry be enough? It is not going to be a big car, just the size of a palm of a woman's hand approximately. Any gel icing colors will work? Any tips on storage and transportation? Thank you so much in advance! 

This is tricky.  Sugar paste drys a lot faster than fondant, but it is not as forgiving when trying to model something like a car, because it does dry very quickly. Fondant offers more working time, but is really soft.  I recommend using fondant with a bit of Tylose added for strength and to help it dry more quickly.  Also, since you need it in a short time, I suggest using Rice Krispy Treats or a piece of styrofoam for the center/base.  The fondant will not be as thick and will set up a lot faster than a solid blob of fondant.

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