How I apply roundup

I recently needed to create a garden space from lawn. I purchased some roundup. I suppose the usual thing to do is buy an applicator. I've found this isn't required even if you wish to do large areas of lawn. From household supplies, I came up with a plastic bucket and an old, string-style mop. As long as there isn't dew still on the ground, it's very easy to see where I've "mopped" the lawn. The premixed solution was on discount, so I used this concentration. It seems to have killed the grass and weeds, at least for now.