Hi Claudia! I’m so excited you’re thinking of making these at your daughter’s birthday party. I went to my rock painting expert friend (Sam from Color Made Happy) and she suggested the best route is solely use paint pens and no sealer. Here’s a post with tips that will help. Be sure to share the results if you end up doing them. And happy early birthday to your daughter!

Hmm… I’m worried the Sharpie might not adhere to the sealant depending on which kind you use. I’m thinking it might be safer to spray paint the rocks white with a good point that’s less likely to chip or come off and then use Sharpie on that. Depending on how much time you have, a sealant could be applied on the finished rocks in the morning and be dry enough to add the wire later in the day.