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Don't put plaster on OSB. Put plaster on plasterboard aka blueboard. OSB is very moisture sensitive. Your plan will eventually result in rotten, swelled OSB with plaster falling off of it, especially if the building won't be heated.


Asking the basic questions is what gets us started.... not silly at all. If they are as simple as nail holes from picture hanging and the like, and there are only a few of them, use spackle. It comes in small quantities, pints for example, so much will not go to waste. It is intended for only small holes. If there are a lot of repairs, you may want to go ...

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