Member of the EUROfusion consortium, DIFFER discovered that a protective vapor shield above the liquid metal self-regulates the surface temperature to 800-900°C. Self-repairing and self-protecting liquid walls are an attractive concept for future fusion power plants, where the reactor walls need to withstand extreme temperatures and particle impacts. This layer can repair itself by flowing in new liquid after being damaged and evaporated liquid forms a vapor shield in front of the divertor which can diffuse power to other parts of the reactor before it reaches the divertor. Outside fusion, oscillatory vapor shielding of liquid metal walls finds a lot of promising applications where temperature-regulation and self-healing of the surface are met. Either directions where the energy efficiency of the process can be increased (induction furnaces, electric conversions,) or energy should be recovered (cogeneration, pressure recovery turbines, H2 recovery…)