3D impression is a full imitation of one's hand or foot, to get a proper 3D impression, they immerse hand/foot into a special liquid, and keep your limbs in it for 40 seconds, forming the exact shape of hand/foot. The liquid is non-toxic, allergy free and safe for all skin types. Kids who are older than 2 months must be sleeping while we take the impression. Once the impression is done successfully, the mold gets filled with plaster of Paris until it becomes dry enough to be extracted out of the mold. 3D molds are not reusable, so in case the impression is not accurate, First Impression Artwork will have to schedule another appointment for another impression.