Why does tuck pointing mortar turn white?

Hello. I have started tuck pointing areas on my house that need it. The only knowledge I have of this is form a good Web site. I bought the tuck pointing mortar (Quickrete brand) and followed the instructions form the Web site. The problem is that in some places the mortar in the finished job turns almost milky white as it sets.This happens after a few hours of setting, with temperature in the 70s, low air humidity and no rain (perfect weather). In other places mortar keeps its color, which is a good match with the existing mortar. I can't find any difference between the spots where it keeps the color and where it bleaches. Any ideas?

Asked By: - 8/29/2009
Best Answer - Chosen by Asker
if you mix it wet and your patch is shallow it will be whiter than if you use a stiff mix and the area you point is deeper...the key to keeping it from getting white is to use a stiff mix and to tool it when it is almost set...wet your joints before filling, with a brush to keep it from setting too could... More
Answered By: Dan the brick man - 8/30/2009
Additional Answers (1)
its called efflorescence it's usually cause by heavy water or bad mix design you can usually brush it off after it dries it won't really hurt anything and it will eventually all turn the same color from weathering
Answered By: Olger H - 8/29/2009
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