How to Seal Terra Cotta Pots, birdhouses, mailboxes, pallet signs, plant markers and other outdoor decor I especially like Thompsons Clear Waterproofer to seal terra cotta pots from water damage. You can find is at Lowes and it runs around $4 a can. All you need to do is take a thoroughly cleaned and dry terra cotta pot and spray the interior with Thompsons Multi-Surface Waterproofer.

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How to Seal Terra Cotta Pots, birdhouses, mailboxes, pallet signs, plant markers and other outdoor decor I especially like Thompsons Clear Waterproofer to seal terra cotta pots from water damage. You can find is at Lowes and it runs around $4 a can. All you need to do is take a thoroughly cleaned and dry terra cotta pot and spray the interior with Thompsons Multi-Surface Waterproofer.

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