woodsmith
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When you are mixing the plaster add the powder to the water not the other way round. For some reason I find it sets a lot quicker if you add the water to the powder. It should stay workable for 40 minutes or more.
You may find it easier to skim a thin coat, not worrying too much about the finish, then while the first coat is still wet, lay on another thin coat, which you can trowel off to a good finish.
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