how long will a fondant iced chocolate cake keep
It maters what temperature you leave it at
Fondant is best for outdoor weddings.
Marzipan under fondant icing makes the cake too sweet, because fondant icing makes the cake too sweet on their own. It is better to use a buttercream with less sugar.
Use rolled fondant instead of butter cream icing. It will be less likely to have issues in the heat.
No. Fondant is made for a cake meant for looks. Icing is made for a regular cake.
No. You do not have to put icing under the fondant on a cake. You can bake a cake and not put any icing on it and just put fondant on it if you wish. No law forces you to put icing on the cake. With that said, How do you plan to stop the icing at the edge of the fondant? Which will you apply first? Normally sugar in the the icing causes it to stick to the cake and also causes the fondant to stick to the icing. So if you have messy people eating your cakes and do not want the fondant to fall off the plates onto the rug as they walk around the living room at a party, it would be best to use icing as a glue.
the frosting
Fondant goes over icing that has been on a cake in the fridge.
Fondant
They decorate a cake. This could be anything from icing, carving, filling, or decorating with icing, fondant, designs, and so on.
Almost any cake can be iced using fondant, but some cakes work better than others. Firmer cakes (white, yellow, chocolate, vanilla, bundt, devil's food, etc.) work better with fondant than soft or delicate cakes (angelfood, for example).
I have no idea about the cost of fondant. However, you can make an at-home version of fondant by melting icing to a liquidey consistency or by applying icing as it is from the tub to a still-hot cake. This will cause the icing to melt, but as you layer it, it will cool and form an icing that is more consistent with fondant, than the thick spread that is usually on cake.
One method is to spread fruit jam (or jelly for those from the USA) on the cake prior to icing(frosting). Traditional flavours used are apricot and raspberry. Jam is also used to help stiff icings like royal icing adhere to the cake.