after engraving on coated flask do you have to put some kind of seal on it?
If it’s anodized aluminum, no sealant is necessary. If not, post what sort of flask you’re using and someone is sure to have some advice for you. 
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its a powder coated stainless steel flask
Take this advice with a grain of salt, but you can “seal” the metal, or the entire flask by giving it a rub-down with WD-40. That will keep fingerprint marks from showing up on the rest of the surface as well.
thank you, i noticed that where its been engraved its easy to scratch and leave marks
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