Not sure why Amazon classified these sealing wax as a toy so ignore my rating on how fun it is and the educational value as I've used it as craft/stationary.
I used these sealing wax to seal my wedding invitations. Later also used them on some ribbons. Both worked quite well.
It's my first time using sealing wax and they are fairly easy to use. Just light it like a candle first and then drip it onto the surface, put the seal down before it cools, and put it aside until it solidifies completely. It takes a good few minutes to solidify completely, so take care not to touch it before it does, otherwise it would be squished - just like any wax.
The only problem I had was that when it's light up, it seems to burn the wax, resulting in dark char-like swirls in the wax. It could be that I'm not using it properly though.
Overall I'm pretty happy with this product.