sealing terra cotta

Maplewood, NJ

Hi, I'm new and excited to find this community. I am using terra cotta flue liners as planters. Is there a way to paint/seal the liner on inside or out to prevent leaching discolorations? I have thought about using a stain on outside to give appearance of verdis gris thinking it might blend with leaching discoloration. I would appreciate suggestions. Thanks

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