Why can’t i seal my bath with bathroom and kitchen sealant?

I fitted my bathroom suit last year, about 7 months ago. I have gone through to self sealing strips that were more than useless, i have used kitchen and bathroom sealant suitable for wet areas obviously. This will be the third time i will have to re- silicone around the edge of the bath as it keeps coming away, the bath is always bone dry, i leave it the suggested length of time to cure but it starts to curl at the edges after a couple of months. Water does sit on the bath edge when we use the shower but surely there is something wrong when you have to re- do it this many times. Do i need to key the bath(sand it)? or is there a high strength silicone on the market? Someone please help before my wife divorces me and the sledge hammer gets dusted off.
Thanks
Tony.

Are you half-filling the bath with water before you seal it? (Otherwise the weight of someone in the bath will pull it away from the wall.)
Other than that I don’t know what you could be doing wrong.
Is the gap too deep/wide? Does it maybe need filling a bit before applying sealant?

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