I found this on Google
I guess the main thing to be concerned about is applying the paper cut outs or whatever and then a few months or years down the road it all pops up!
A finished piece of furniture more than likely has a finish that will repel things on top of it. Normally, that's a good thing--like when you spill that glass of milk, it will bead up and not soak in and stain the wood. The coating makes the wood less porous, as it has sealed the pores of the wood. But if you want to add something else on top of a finished surface that you WANT to stick, it might not.
There are ways around this. You can, of course, strip the wood in the area you will be decoupaging.
Or, you can sand down the area a bit--get rid of the shine, especially, to provide "tooth" to the surface so that other things will grab hold.
You can apply a clear sealer to the surface, such as Jo Sonja's All Purpose Sealer or Decoart's Multi-Purpose Sealer, both available at your local craft stores. Those products seal off the old surface, and also provide a bit of tooth to the new surface so that your new items will adhere better.
Raw wood is the best, but you can work around it.
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