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shelf primer in molds adheres to glass

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shelf primer in molds adheres to glass

Postby kwaale » Mon Feb 05, 2018 10:46 am

We are coating commercial ceramic slumping molds with bullseye shelf primer according to the directions and in the past few months it has begun adhering to the glass (previously for years, it worked fine--same primer, same molds). We are slumping wine bottles--process temp of 1410 for 20 min. hold. Does powdered primer get old and no longer work? Any other ideas as to what the problem might be?
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Re: shelf primer in molds adheres to glass

Postby marykaynitchie » Mon Feb 05, 2018 11:45 am

Are you scraping and recoating the shelves with each firing?

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