It is not the size of the grout line but rather the type of grout. If you can get it to stick to the grout then it is good. I believe they are designed to be used on sanded grout but I have used it on unsanded, even an epoxy grout from laticrete

On Oct 8, 2013 8:54 PM, "Perfect Marble 2" <dayron.padilla13@gmail.com> wrote:
What is the thinnest grout, you have used for color sealing grout 

Sent by iPhone 
Dayron Padilla
Perfect Marble


On Oct 8, 2013, at 7:47 PM, Lorne Greenberg <lorne@fabracleen.com> wrote:

Also gives you the ability to change the color of the grout.  For example,  if the original grout was white but now they painted and want the grout to be antique white. 
It also makes the grout a uniform color.  Sometimes even brand new grout can be different shades from different lots.
Some of them contain an antimicrobial.
It provides more protection than an impregnating sealer because it is a topical.

On Oct 8, 2013 5:19 PM, "Roger Konarski" <qm144@yahoo.com> wrote:

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