I put this down last night and saw results today.  I mixed as per the instructions in the
battery operated sprayer from the same company.   I saw droopy and browning plants
tonight.  I don't know if it actually
works that fact or if it was in combination with the 90 degree day we had.   I used it on grass on the driveway and a
rock covered bed.   I can't say if it
works for 4 months since it just went down last night.   It appears as if it is as least as effective
as the regular round up which works great.
From the vendor:
·                          
Dual-action formula kills existing weeds
and prevents new ones from growing for up to 4 months
·                          
Kills
weeds to the root. Guaranteed! Consumer Guarantee: If for any reason you are
not satisfied after using this product, simply send us original proof of
purchase and we will replace the product or refund the purchase price.
·                          
Use
on driveways, sidewalks, and patios; along fences, foundations, curbs,
retaining walls and edge of lawns, as well as on decorative rock or gravel areas
·                          
Rainproof
in 10 minutes
·                          
Visible
results in 3 hours
If reviewing a product, it may have been received free of charge. That will NEVER have a bearing on my recommendations. 
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