OP, you still did not state the type of tub, so a specific answer is not possible. I am assuming a PVC or similar tub in which case the typical PVC PIPE glue (or fiberglass repair kit) and a hypodermic needle may be able to fill in the crack and seal it, as for the hiding of the crack you may get lucky with a spray can of paint for PLASTIC, followed by very careful buffing. If the tub is any other material, I agree with above you need to find out why it cracked and will probably need to replace the tub.
Can you provide a picture?
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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