I was told when I started my landscaping years ago. To always buy plaster that was fresh. Doubt they have expiration dates on the bag. But best to buy from a supplier that has a good turnover in product. If you know someone in the trade ask them where they go. I used 50 pound bags of what was called Special White. I believe the mix was 2 parts plaster to 1 part water. You had about a 20 minute work time. The plaster in the bag should have a very powdery feel. Not clumpy. The reason for buying fresh I was told that over time moisture can effect it and it won’t mix well or cure properly. Many bags often times have slight tears in them. After you open the bag. It’s best to store it in a container. The scenery sources have a good product. But if your doing a large layout it can get expensive. I want to say I used about 4 bags on my layout. The end result. You can drill it for trees and after 30 years I’ve had no issues with it.
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