I purchased the metal ties and tool. I hated it, as they didn't want to tighten as much as I wanted. Perhaps I'll try a different brand.I did the same as Omelette-in-progress, but I didn't use regular plastic zips, instead I used stainless-steel ones. I can at least be sure that the UV won't affect them. I did purchase an applicator tool (like this,) to tighten and clip the ends off, but it can be done with just pliers and a pair of snips of some sort. The tool was just faster and more convenient.