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Sealing Plaster for Outdoor Use

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. Any help will be appreciated. Thanks and Blessings to you.


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By guest (Guest Post)
June 25, 20070 found this helpful

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. It will also make a water-resistant area on any cememt you spray it on. So, use common sense and don't do anything hastily. Decide what you want from it. White is a lovely color for the patio. Colors eventurally peel/chip/fade.


Good luck, and God bless you. : )

Reply Was this helpful? Yes
January 14, 20090 found this helpful

Thanks for the help! I was just about to ask the very same question! Be lucky!

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