Like with everything it's important to use the right tool for the given situation. I use a rope wick applicator often. I am not a builder of things. Murphy had me in mind when he said whatever can go wrong will go wrong. I think the idea presented in the video is sound but I don't like the idea of a depending on a shutoff value for controlling flow of herbicide to a sponge. It seems leaky to me. The applicators you can buy has no valve and I don't know why they don't leak but I have never had the problem. I think a lot of it depends on the kind of rope used and the plumbing principles used to build the reservoir. The viscosity of the liquid is also important I believe. I only use glyphosate at 1:1, herbicide to water. I will depend on the commercial varieties. They have been tested and they work. They come in various widths. Some are hand held to tractor mounted.
