I think that you'll lose a lot of detail if you just dip it in slip. That works well for absorbent things like woven fabrics and lace, but I think with a wasp nest the slip will just sit on top and all the detail will be on the inside. I suppose if you build up with very thin slip it might work, but you may also have a problem with the slip cracking as it dries around the nest. I think you'll just have to try it and see, unless someone else here has already tried it. If you really want detail, make a plaster mold of the nest that you can then slip cast.
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