Black Blue Tac or similar?

Black blue tac or similar?

Anyone any idea if black blue tac is available or similar. Have a slight watter leak near o/s door mirror into car running down door card over speaker onto floor. Blue tac stops it but looks crap! Could use silicone seal but that will be a pain when I need to take door card off. I need something malleable like blue tac but black! Any suggestions welcomed.

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