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how to seal the hollowed sculpture to protect it long term? Answered

Hi, I took this course last year, and since then I am going crazy with projects to do, paper mache is the best thing I came across so far and I am forever thankful. Nowadays, I am doing lighting items using hollowed-out sculptures. The thing is, I'm worried they will get soft over time and lose their shape. So I was wondering if there is anything that I can use (a sealant maybe) to make it sturdier. Any suggestions are welcome, thanks again.