Your whirlpool should have been installed with a layer of mortar or plaster underneath it. You should have some sort of access for the pump. You might be able to inject some LOW expanding foam to strengthen the bottom. Your fiberglass repair should be done by a pro. They can repair a crack so you never no it was there. Check with the manufacturer to see who they reccomend in your area.
Wood shutters need repair
how-to question on repair
Repair Wood Rot at bottom of Wooden Grand Portico Co...
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