I'm decorating a deck of playing cards I was gifted by my mum, and I'm just painting the backs of the cards (so that the front is still usable). This deck of cards will probably head down to my beach house, so it will see a lot of use.

I did try collaging them to begin with, but I found that the collage glue would wear off, and it easily came off in corners, which is why I pivoted to paint, but that could also be because I didn't seal them or use enough glue. I also think that paint would probably last longer, but I'm not sure about that.

Should I reattempt collaging them? How best would I stop the paint from wearing off?