When determining the type of emulsion to use for your screen prints. There are a couple questions that can help narrow down the answer. What type of ink is the first question. Photo polymer emulsion is only for plastisol ink, and if you try using water based ink with photo polymer then your emulsion is going to break down quickly and the your stencil will be ruined.
Ecotex® AP-Blue All Purpose Ready to Use Screen Printing Emulsion - All Sizes
How to Screen Print: Ultimate Guide to Choosing The Right Emulsion For Your Print
Ecotex® AP Blue Screen Printing Emulsion (Pint - 16oz.) Pre - Sensitized Photo Emulsion for Silk Screens, Textiles, and Fabric - For Screen Printing Plastisol Ink, Screen Printing Supplies : Arts
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Photo-emulsion Screen Printing : 7 Steps (with Pictures) - Instructables
Screen Printing Emulsion - What Are My Options — Texsource Screen Printing Supply
Photo-emulsion Screen Printing : 7 Steps (with Pictures) - Instructables
Which Emulsion is Right for Me?
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How to Coat a Screen for Screen Printing with emulsion. Step by step tutorial for beginners and pros