I've noticed I've been getting oil stains on my cardboard cake boards lately (when using Wilton buttercream recipe). Any ideas on what is creating this issue - I don't remember having this problem when I initially started making cakes. I have a big cake coming up for work, and would prefer not to bring a cake with a oil stain circle around the cake!
Any help is greatly appreciated! Thanks!
Welcome to CC!
It's important to cover the cake board with foil, freezer paper, clear contact paper, foils made especially for cake boards. These can be found in silver and gold at Michaels or Wal-mart or in a rainbow of colors that you can order on-line or find in cake supply stores. Some people cover the board with wrapping paper and then clear contact paper. That way the paper can be coordinated to match the cake.
It's especially important to cover the cake boards when making a tiered cake because if the board becomes soaked it will become weak and threaten the structure of your creation.
I use the waxed cake boards. When I use the unwaxed I always cover with fancy foil or just plain foil.
I really like coordinating w/wrapping paper... or have used cheap fabric covered w/clear plastic for fabric or contact paper cover for wrapping paper...I once used one of those cheap disposable table cloths from the dollar store and cut it to size. My monkey cake pic is fabric covered cardboard covered in clear plastic.
Can someone explain to me what contact paper is and where to get it? 
Contact paper comes in a roll and can be found with the shelf liner at places like wal-mart. It can be used to line shelves with, etc. It can be clear or with a pattern.
It opens up a lot of options because you can cover the cake board with a material that the cake can't sit on like fabric or wrapping paper and then cover it with the contact paper!
Some will say that it's not a food safe/approved use but I'm not too worried about that aspect, jmo!
The doily cake boards by Wilton have a wax cover on the them. The oils in the cake and icing will not bleed through and show, so you can put the cake directly on them. In fact, for cakes for my family, I will reuse those boards by just carefully washing the surface. (4 June and July birthdays in 4 consecutive weeks - buying new boards every time gets old very quickly)
However the plain white cardboard cake circles are not covered, so oil will soak into them.
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