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Old 09-12-2012, 09:21 AM
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302 Z28 302 Z28 is offline
 
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Quote:
Originally Posted by Old Fool View Post
hydrochloric acid, it may etch the concrete

http://www.instructables.com/files/o...F8GN4CZIND.pdf
Yikes, no kidding 15-25% Hydrochloric acid

Vince
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