In the market, there are many types fertilizer coating materials, mainly high molecular polymers, resins (polyurethane resins are used more), sulfur, paraffin wax, asphalt, etc. These materials can be used for organic fertilizers or suitable for fertilizer coating.
However, when you choose the coating material, you must choose the coating material suitable for your fertilizer particles. First of all, the coating material you choose must not be harmful to the soil. Secondly, the coating material cannot reduce the fertilizer efficiency. Finally, the coated fertilizer is not easy to agglomerate.