Tombow 52180 MONO Aqua Liquid Glue, 1.69 Ounce, 1-Pack. Dual Tip Dispenser for Precise to Full Coverage Application that Dries Clear.

I use these and glue them (https://amzn.to/3M2NMYp) to a non stick surface (I recently found that laminated sheets are good for this), making sure to get the glue more around the outer edge as a kind of barrier. Then after it dries, I pour a small amount of resin to create a thin fill, and let it dry. From there, the process is to layer art (I print stickers that are exactly the size of the opening) and resin over the top, and finally glue the badge to the back with some resin.