Quote:
Originally posted by Don Ro
The main active ingredient in Roundup is Glyphosate isoproplymine salt...lots of weed killers out there have GIS as the active ingred. But since you already have R/U...
Be mindful of the American approach - More is better. 
You don't want to over-mix it - adding more than the label instructs you to do.
If so, you risk the GIS burning the tops and killing the vascular tissues in the above-ground parts of the plants (top kill). The plant may look like it's dying, but in fact, the quickly-dead above-ground tissues are no longer able to translocate the killer agent down into the roots where weed kill must occur.
Good luck...be patient.
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What Don said about GIS!
Keep in mind also that RU is a POST emergent killer and it does not kill seed. After killing off the stuff with RU (or similar) you will also need a pre-emergent killer to stay in the ground and keep killing stuff. Otherwise, your weeds will keep coming back every 20 to 60 days (depending upon your local conditions).
Remedy, by Dow Chemicals, has an active ingredient of Triclopyr ester in a kerosene base carrier. Triclopyr is considered a "safe-to-grass" herbicide, and is designed to kill weeds from pasture land. So if your patio growth is grass, this may not be your best choice.