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For an every day use bath sealing is probably worth your time, especially if there are small kids taking baths. We use a spray on item called Grout Shield. It can be applied while the grout is still wet but that's with a cementitious grout, it may work differently with the premixed.
FWIW, you might want to return that and just get a bag of grout. Mixing it isn't a difficult task and as was mentioned it's probably easier to apply and clean up.
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