Here are a couple ideas for your DIY decoupage.

https://www.themakeyourownzone.com/make-your-own-mod-podge-for-decoupage-crafts/

https://www.youtube.com/watch?v=kX8AiPQwb-M

Hi Barb: It's really easy:

1. Use craft stick to mix together three parts Elmer's® Glue-All® with 1 part water in a paper cup.
2. Stir well.
3. Use sponge brush to spread mixture over surface.
4. Papers may stretch or bubble up initially, so smooth out air from bubbles with finger and then go over area again with foam brush.

And, here's a site that should give you a bit more information:

https://www.elmers.com/blog/how-make-your-own-decoupage-medium

Good luck

Hi there! Here's another one! https://www.hometalk.com/3635368/make-your-own-mod-podge-much-cheaper-for-decor-and-craft-projects

Make Your Own Mod Podge (MUCH Cheaper) For Decor and Craft Projects

Mix:

Elmer's school glue (4fl. oz.)

1/3 cup water

in well in container with top (jar with lid)

Hi Barb, hope this helps you out,

https://www.youtube.com/watch?v=kX8AiPQwb-M

You can add water to Ehlmer's Glue

I mix 1 cup of Elmers Glue with about one-third cup of warm water. Start with less water and add as you go. You can always add more water, but you cannot take it out. I find that using warm water makes it easier to mix.