O.k. so I am tired of waiting for a calm day to spray around my mulch beds. And I have a paint stick that I haven't used in years, so I got to thinking why not just load it up with some round up and roll it on the weeds. Only problem is I tried just using water (as a trial to see if it would leak) and it is to thin and wants to drip as I walk between the beds. Now I could carry it around in a bucket but that would be a pain. This brings me to my question. What can I add to it to thicken it up enough not to want to drip? Thanks for your suggestions.