yeah it does depend how you mix it the razor may have more active ingredients in it but your probably meant to mix it so its the same ratio of actives/water as you would do with roundup and there is a point where more round up wont have any more effect on how quick it kills the weeds at work we use 1L per 100L of water and we get a good kill also you can use driftex when spraying to help protect nearby plants if it rains