One thing which does help with a bath, and presumably a shower tray too, is to load the container up when you apply new sealant and to leave it there until the sealant has dried/cured.
(plenty of water in the bath, for example, maybe some substantial weights in the shower tray).
That way it is less prone to breaking the sealant when you get in, and it all settles down by a few mm.
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