Hi Vannessa! These crafts have held up over the years. We still pull out my daughter’s heart every year as part of our Valentine’s decorations, the original one we made is nearly 3 years old now.

So sorry to hear you had problems with this activity! We’ve done it several times over the years and not had any issue with it leaking but I can understand how it might happen and how disappointing it must be. 🙁

We didn’t have an issue with our clear glue when we made the hearts but when we made our Christmas version we ran into this issue because out metal cookie cutter was slightly bent. Once we bent it back it worked fine, I put a heavy book on it when it was drying to make sure it stayed flush against the table. Maybe run a bead of hot glue around the inner edge? I know consistency varies a bit from brand to brand when it comes to glue but I’ve also heard that if you leave the lid off your glue for a day or so it causes some of the water to evaporate and makes the glue thicker. Hope this helps!