I'd use something waterproof, as you'll probably want to at least wipe it off. Polyeurothane should work. There's another one that I've heard mentioned in another thread a few months ago, but don't remember the actual name for. I think it has glass in the title and you pour it on (and I think spread with a paint brush) and it creates a nice glassy finish that should be waterproof. I've seen it a Michael's and if I remember correctly, the smaller bottle (8oz, I think) runs about $8-10 (aka "a coupon item" to me). Haven't tried it but the stamper that suggested it raved about it.
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