Good topic! .... And hell yes, fulvic is the King when it comes to foliars
...By itself it's fantastic, the plant can use it as a Carbon source, at least the smaller molecular size chains that can be taken directly into the cells,... large ones less so, humic is too big, and is better in the soil..... What's more, it chelates other nutes nicely, protecting them from reacting and getting lock-up into something insoluble... This is why it excellent in most any foliar application, like micronute supplements, light feeds, kelp, Si,...
With any foliar spraying, to get the most out of it you need to use a wetting agent of some kind. This take the surface tension out of the soln. so it coats and sticks better, doesn't just bead up... Also very important is to get the undersides of the leaves, more stomata are located there vs. topside, and that's the only way in... Well, unless you have Optic Foliar's Transport! That stuff is magic, it allows temporary penetration through the leaves cuticle layer, taking whatever is dissolved in it along for the ride; it's analogous to DMSO use on us animals -
Good info's here in Reference section on
chelation and humic-fulvic....