A two-part coatings system is provided. The system includes a resin component and a crosslinking component. The resin component includes a mixture of an epoxy resin and a polyurethane resin. The crosslinking component includes a curing agent and a catalyst. The polyurethane resin includes a donor for a Michael addition reaction and an acceptor for a Michael addition reaction. The catalyst is configured to facilitate a Michael addition reaction between the donor and the acceptor of the polyurethane resin. The curing agent is configured to react with the epoxy resin.

The present disclosure provides photo-polymerizable components, photo-curable resins comprising one or more of such monomers, as well as polymeric materials formed from the photo-curable resins. Further provided herein are methods of producing the compositions and using the same for the fabrication of medical devices, such as orthodontic appliances.

A 3K primer coating composition containing a waterborne epoxy resin dispersion; a polyurethane dispersion; and a curing component containing a non-isocyanate crosslinker component, and optionally further containing an isocyanate crosslinker component, is provided, along with a primer coating formed from the composition. The coating includes a network of crosslinked epoxy resin regions and crosslinked polyurethane resin regions. The crosslinked epoxy resin regions include units from the epoxy resin dispersion and the isocyanate. The crosslinked polyurethane resin regions include units from the polyurethane dispersion and the non-isocyanate crosslinker component.

A method includes obtaining a metal substrate coated with a polymeric film which includes a first polymer obtained using a cationic photoinitiator and a second polymer obtained using a free-radical photoinitiator. The method further includes deep drawing the metal substrate and the polymeric film while the polymeric film is in a first crosslink density state and curing the deep-drawn polymeric film to achieve a second crosslink density state.