I was in my local HD shop the other day and I noticed a display on the parts counter with several gas treatments. As you know all gas treatments usually have some degree of stabilization from water, and also have cleaning agents to remove gum deposits. But this one (K100gm) claimed to also prevent rust. There was a carpenter nail in each small jar. And in each small jar (inluded with the nail) was a different kind of gas treatment additive. All of the bottles (except the one with K100gm) showed clouded solutions and you could see rust forming on the nail. I remember Stabil was one of the ones that was tested but I did not see one with Amsoil's Quickshot. This really got my attention but I began to wonder exactly what all this means. So I've written the following questions that I would like input from everyone on. 1. Have any of you heard of this K100gm or used it ? 2. What other gas treatments have rust protection also ? 3. How big an issue is rust protection (as far as an additive goes) ?