We use this stuff - mix it up in a 5 gal pails, slop it out and around, set the tub and stomp in it until it's set where you want it. Once dried it's perfectly solid and won't give a fiberglass tub that hollow feeling.
http://www.usg.com/usg-structo-lite-...t-plaster.html
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Some guys they just give up living
And start dying little by little, piece by piece,
Some guys come home from work and wash up,
And go racin' in the street.
Bruce Springsteen - Racing In The Street - 1978
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