They worked just fine, recommend the Vigoro fabric staples.
Roughly 10 gauge weather-resistant steel. Within a couple of years, they begin to corrode substantially. One would think these could easily be dipped in a vinyl or plastic coating to provide substantially longer life/usage.
I spaced my staples out 10 inches apart. I think it would be personal preference. The closer they are the better weed barrier.
They are made in China. There are no similar better product at Home Depot.
Yes I used them for that purpose
install them using a hammer. If you own a mallet, even better.
Small gauge, bend over easily. I would estimate around 16 gauge, thinner than a cheap metal coat hanger. Should be OK if you don't have compacted or soft soil.
The thickness of the wire is 1/16th of an inch. It is the same size as a I/16th wood drill (without being a drill).
First off... contrary to popular belief, a vapor barrier still works just fine with holes pokes all over. You could walk on it with golf shoes without significantly affecting the plastic's ability keep moisture from evaporating into the crawl space. (Radon abatement might be a different story, though.) That said, it'll depend on what's under the plastic. If it's firm, level soil, this might work. It's it's uneven or if you have pea gravel to get through, 4" might be a bit short. But a lot of crawl spaces just have the vapor barrier laid down and left unsecured, as the plastic is pretty thick/heavy. So you may not even need staples.