How to waterproof terra-cotta ?

Christina
by Christina

I bought this very tall and heavy piece of terra cotta. It’s oval shaped and is hollow and has a hole in the top. It’s unglazed and has a rough surface. I finally decided it would make a wonderful fountain but it has to be waterproofed inside and out. Whatever I use in the inside would have to be sprayed on because it’s about 42” tall and narrows towards the top. Any product recommendations for waterproofing?

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