Instruct: Classify a review into positive or negative sentiment.
Query: Corroding ring

Not only does the cap not seal, but once the rubber sealing ring that surrounds the cap rips and corrodes off, as it did on mine after 2 months, then the only thing the shaker is good for is measuring recipes. I had to find a new bottle to store the dressing in, and the MIU Dressing Shaker is now collecting dust in my cupboard.