Fix crack/chip in colored concrete

We have a large patio with retaining walls on both ends. It is colored, stamped concrete. It has a crack running from the house out to the lawn. I was thinking it may be a good idea to somehow seal that crack so that water can't get in there and make it worse. How do I do this? Is there a clear substance that I can use on this crack? It is a a narrow crack. Hairline in parts, maybe a millimeter in others parts.
I also have the same stamped concrete for a sidewalk leading to the patio. It developed a crack in 2 places, and one of the cracks chipped several pieces off. I would like to seal this crack, and somehow affix those pieces in place. I would probably need something clear here too.
Thanks for the help/suggestions!
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ibrubeer had written this in response to http://www.thestuccocompany.com/maintenance/Re-Fix-crack-chip-in-colored-concrete-379400-.htm :
WW wrote:

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Thanks for the suggestion. I'll try and find some of that and see if it works.
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