I want to know how to seal a plaster casting. We just bought 2 plaster pillars. I want to use them outside. How do I keep them in good shape in the wind and rain.
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If unpainted, with no plans to paint them in the future, I'd use Thompson Water Seal two coats missing no area, drying well between coats, including spraying the bottom and inside, if possible. Plaster will easily deteriorate in the outdoors, just crumbling away. But
paint helps slow the process down, and Water Seal does even better BUT you must do it annually.
It's not easy to paint over anything Water Sealed, I hear, so I'd think it through before doing anything.
AND, take the spraying way out away from anything
and spray on a still day, on LOTS of newspaper, because it is Silicone based, and will likely kill whatever it lands on or drifts to.
Good luck, and God bless you. : )
Thanks for the help! I was just about to ask the very same question! Be lucky!
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