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Coldworking Intro | Punty Removal

Beginner Class Prerequisite : None

  • 150 US dollars
  • Public Glass

Service Description

Do you have a cup/ vessel that doesn't quite sit straight or have a punty mark sticking out? This 3 hour introductory class will teach students how to grind down glass using diamond covered wheels and a belt sander. This class is meant to introduce students, in a shortened format, to what we call the cold shop- all of the machines used to grind, cut, polish, engrave, and sandblast into glass. You will learn how to safely use our cold working equipment: including the lathe, belt sander, and lap wheel. The goal of this class is to learn how to make your punty marks disappear. Take a messy punty mark and turn it into a beautiful polished lense or shiny flattened bottom. Please bring your Respirator with p100 particulate filters, wear closed-toed (possibly waterproof) shoes, clothing that is not loose or dangling, something to tie up long hair, and clothes that can get Wet. A water bottle is recommended. After taking this class please look into taking Coldworking level 1 which will enable you to rent the cold shop on your own.

Upcoming Sessions

Cancellation Policy

For help with your booking please contact Cancellation Policy: No credit or refund can be issued if a cancellation occurs 9 days or less before your class date. This helps us guarantee stable wages for our hard-working artist instructors. If a cancellation occurs 10 days or more before the start of class, please submit a written request to as soon as you know of a possible conflict. Your account will be credited with the cost of the class. You can apply this credit to a future class, our online shop, or event. Please email to use the credit on your account. Excessive rescheduling will result in an administrative fee. ​ Online class registration closes 2 days before the first session. For late registration, questions or guidance on our programs, please email us at: As a small nonprofit, our goal is to keep access to the studios affordable and to employ the independent artists who have committed to teach you. Monetary refunds are issued at the discretion of management. In the rare case that we are able to issue a refund, our processing platforms will keep a minimum of 10% non-refundable fees. Keeping the credit on your account is highly encouraged. It ensures that you get to keep 100% of your credit while supporting our artists and community. Thank you for your support and understanding.

Contact Details

  • 1750 Armstrong Avenue, San Francisco, CA 94124


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