“Mosquito sprays containing IR3535 are very gentle on the skin and have been used all over the world for many years.Insect repellent was carefully inserted into a biodegradable polymer using a specialized 3D printing technology, and the mixture of substances was successfully shaped in various ways.After conducting various experiments and simulations, the team predicts that the insect repellent needs well over a week to evaporate completely at a temperature of 37°C (98,6 °F, i.e., body temperature).Reference: “3D-printing of the polymer/insect-repellent system poly(l-lactic acid)/ethyl butylacetylaminopropionate (PLLA/IR3535)” by Fanfan Du, Harald Rupp, Katalee Jariyavidyanont, Andreas Janke, Albrecht Petzold, Wolfgang Binder and René Androsch, 14 July 2022, International Journal of Pharmaceutics.Why make it a ring why not just make it like a broach so it does not have to have contact with the skin this is very exciting newsit might require body heat to evaporate at the intended temperatureI am confused about the novelty of this since similar products have been around for decades."