The Solarez Soft Board Ding Repair Kit is for Styrofoam & EPS-Core constructed soft surfboards, bodyboards, and SUPs. These boards have become quite popular these days, but provide a real challenge to repair. Sponge-Rez is awesome for repair on the outer skin and hull, but can melt the inner core, If EPS is visible, use the Solarez UV cure epoxy to make a protective coating over the EPS, cure it in the sun for 45 seconds, now apply Sponge-Rez on top. Internal repairs such as delamination or deep dings can then be repaired.