I've never used a straight liquid fish emulsion product, but I don't believe it is intended to be used as a foliar feed. The label should have the recommended applications and rates.
I have however used combination liquid fish/seaweed as an occasional foliar feed and as a soil drench with good results.
Like any other organic fertilizer, it won't burn your plants but like any other fast acting fertilizer—too much or too often can have other detrimental effects.
What other fertilizer(s) do you normally use for your vegetables?
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