Position two 1-layer cakes on board end to end. Ice sides and tops smooth. Pipe tip 32 shell bottom border. Open canned fudge icing container, remove foil. Microwave on 50% power for 1 minute; stir. Continue to microwave at 30 second intervals until ready to pour. If a microwave is unavailable, icing container can be heated on a warming tray or in a pan of water on a stove. Carefully pour icing over top of cake, let small drips of icing run down cake side (make sure icing doesn't reach bottom border).