Instructables
Picture of Make Your Own Mod Podge

Step 1: What You'll Need:

Picture of What You'll Need:
Half a bottle of school glue Water

Step 2:

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The recipe is half glue half water

Step 3:

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Pour water into bottle halfway

Step 4:

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Put the cap back on

Step 5: And Shake!

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Until the water and glue are evenly mixed

Step 6: Clean Up Any Mess

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Step 7:

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The mod podge should be a thick watery, gooey consistency

Step 8: Craft!

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Step 9: Now You're Done! Enjoy!

Picture of Now You're Done! Enjoy!
 
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Are there by anychance reports of how well this holds up and/or how the finish compares?
This article explains it well, but to sum it up... the school glue and water  is okay for short term projects where quality or durability is not an issue.