They are touted as being good for strengthening the stems of plants in hydroponics, and I thought that maybe it may be good to try for seedlings. To me, some tomato varieties, especially, as well as tomatillos, seem very weak, and easily snapped, either moving them around inside, transplanting, or on a windy day. I've had some varieties that I never tried growing again, as all were broken on windy days, while others were OK.
I got some of that Skunk Lab silicates powder, which, when mixed, is only needed in hydroponics at about 1-2 ml/gal. So I figure I'll try a very small amount when watering seedlings - 5 drops/quart, for watering. Too early to see what they look like, plus the only things I am planting that I know are the thin and weak type are tomatillos. I'd have to try those old varieties of tomatoes, to see if it helps with those.