After removing old paint from a concrete patio, can I just stain? Or should I do more to improve the outcome of the looks & last of the new stain, also can I use stain with multiple colors to achieve to look of rock at the same time?

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after removing old paint from a concrete patio, can I just stain?

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Almost

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or should I do more to improve the outcome of the looks & last of the new stain,

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That depends on the manfu specs of what you are going to choose.

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also can I use stain with multiple colors to achieve to look of rock at the same time?

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Again depends on how they stain is applied and what your skill level is

I attached some vids to give you some ideas and what's involved here. The vids will impress you on the 100s of ways to satin Crete/treat Crete.

YouTube - Soycrete Concrete Staining Indoor and Outdoor Projects
YouTube - Acid Stained Concrete
http://www.youtube.com/watch?v=DvL9N...eature=related