Lynnie,
I think you are talking about sealing the bath with silicone.You will need to fill the bath with water,and run a bead of silicone sealant all around the edge of the bath where it meets the wall, and leave it to cure overnight and then empty the bath in the morning.This is quite a simple job to do,but it might be better to get someone to help if you are unsure,or you have nobody there with you.That will certainly stop the water going under the bath. Good luck to you.
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