'SSIC - Standard Subject Identification Code', All Acronyms, 17 January 2018, <https://www.allacronyms.com/SSIC/Standard_Subject_Identification_Code> [accessed 17 January 2018] Bluebook All Acronyms, SSIC - Standard Subject Identification Code (Jan. 17, 2018, 12:01 AM), available at https://www.allacronyms.com/SSIC/Standard_Subject_Identification_Code. CSE All Acronyms. SSIC - Standard Subject Identification Code [Internet]; January 17, 2018 [cited 2018 JAN 17].
Set your timer for 1 minute and wait. You can keep the etching cream on the glass longer and you will get a more intense etch, but the manufacturer (and I) suggest you start with the recommended 1 minute. When the minute is up, run the glass under luke warm water to remove the etching cream.
Be careful not to use too much etching cream because you don't want it to drip down the side of the glass. Make sure to cover the entire exposed surface in the stencil completely. Follow the directions on the etching cream for how long you need to let it sit on the glass before removing it.