I always do, the MMF needs something to stick to so I always cover my cake with BC first ......I've never tried it with anything else so I'm not sure if it would work with anything else.
Wow thanks cindy for replying so fast...this is why I love this site.....I thought the same thing too but wasn't sure If I can try It without. 
Hi....I used MMF for the first time last weekend and had a question also...
This could probably go for any type of fondant....how do you get it smoothly and nicely on edged cakes, like square cakes? I found the corners to be tricky and wasn't sure how to make it look nice without it bunching up or overlapping. Any tips would be appreciated for futures cakes. Thanks!
I am also curious to know - do I have to wait for the BC to crust before covering the cake with the MMF?
No, do not wait for your BC to crust over, otherwise your MMF won't have anything to stick to.
Can't offer any tips on getting nice corners though.
Hi....I used MMF for the first time last weekend and had a question also...
This could probably go for any type of fondant....how do you get it smoothly and nicely on edged cakes, like square cakes? I found the corners to be tricky and wasn't sure how to make it look nice without it bunching up or overlapping. Any tips would be appreciated for futures cakes. Thanks!
I'm having this trouble too, folds over, rips and just gave up on square cakes with fondant, rounds easier.
I didn't have any trouble with my corners on the square cake I did covered in fondant. I will say this though, lay the fondant on the cake and then start smoothing from the top down the sides very gently , sort of cupping your hands around the corners......it's hard to describe I guess but I didn't have to fold my sides or anything, I just smoothed it down and then trimmed it around the bottom.
Its suggested in one of my books that sqare cakes, when using normal fondant (don't know about MMF) can be done in two parts ie: sides, then top. Another great hint when smoothing fondant is to use a wad of fondant, which you rub and smooth the cake with. Hope that this makes sense. 
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