Um, any clay product will NOT "seal" a wound. A water tight seal is impossible with it as clay dries out, curls, warps, falls off, etc. In doing all that, it allows outside moisture,
If you're looking for a sealant--use Preparation H.

Yeah, Preparation H covered with duct tape. This treatment provides an air tight seal and keeps the wound from drying out. It's been used for years by alot of extremely experienced bonsaiists.
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Oil based modeling clay will not dry out.
You are giving me a good idea. I will not try Preparation H, however, I would try Surgilube instead. Thank you. Bonhe