I just purchased some bulk liquid food grade silicone. This in a 5 gallon container, way more than I wanted, but the price was not bad, $175 so I though I would try it. This seller does sell retail. I have provided the link at the end of this post should anyone be interested or want to know what to avoid.
I don't know what the food grade silicone sprays are like but I do not recommend what I have gotten. I was expecting a pure silicone. The food grade has some type thinning agents in it. I tried it on some scrap latex, it does not harm the latex at all and it does impart a slight shine to it. The problem is the thinning agents have a solvent type odor when applied but these disappear in an hour or so, not the greatest for spraying on a garment being worn. The shine I got was slight probably because I did not apply much to the latex and the coat of silicone left is extremely thin so I imagine several coats are required to get the latex very shiny.