I have very limited experience with foliar sprays..I do spray my girls with epsom salts a few times during a grow, however, I have never given them any nutrients, (aside from the magnesium in the Epsom Salts), and with my indoor house plants I spray them with an systemic insecticide.
The only thing I can advise would be to be careful how you store them if they are in the container for long periods..years ago,I purchased some pest spray that I had used multiple times on my house plants with no ill effects, however the bottle seemed old and I felt like there was a lot of evaporation, which increased the concentration and burnt my plants badly, and ever since then I make sure to store them correctly, inspect your new bottles when purchasing, and if you make some up yourself (and wish to store them), be sure to keep them in a cool dry space, with the mixture very tightly closed to avoid any issues.
On a side note, I don't use pest sprays on my canna girls, choosing pest preds instead
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