Cut out all the old sealant with a a sharp craft knife. I use one of those cheap ones that have a very long blade that you can break sections off.
I carefully use it with a lot of blade extended. This allows a better angle of attack and the blade does bend.
Use a caulk gun with the silicone sealant in a cartridge and try not to squirt too much out as you can always add more. A steady hand is needed as you work along the gap.
I have tried various tools to create " the correct profile" but I find a wet figure is ideal to shape the seal. Regular wetting the finger is required. Job done.
Just done a bath and a shower and am well pleased with the result.
The down side is a lot of silicone left and it does not keep for long. It does however make a good glue for some jobs.
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