can i repair my leaking sink or do i need a plumber?

the underneath of my sink keeps leaking, its on the part thats connected to the bowl, all of the pipes are fine. I have taken all of the sink apart and tightened everything i also put silicone sealant around the sink and around the joins but it still leaks :(
i dont know what else to do, could there be a seal that needs replacing if so what one??
thanks for all of your help

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