If you are putting them on your nails you can just put them directly onto slightly wet nail polish or put a drop of clear polish on the nail and then put a stone. If you are planning on putting them on something else you can use a small drop of glue, they don't have their own adhesive, since I believe they are mostly used for nail art. Hope this helps answer your question. :-)
no at the nail salon i've seen them use a freshly applied clear coat as adhesive. the studs the applied stayed on for a 2 and half weeks. u can use clear drying super glue if that makes u feel more comfortable.