Live project demonstration using Avanti's AV-278 Low Vis Hydro - a hydrophobic urethane - to fill void space behind a coastal seawall. Seawalls often can suffer major structural damage if not maintained. The costs associated with major repair or replacement can be enormous. However, with a bit of injection grouting we can seal leaks, fill voids, and stabilize soils and hence prevent future soil washout, settlement, and structural damage.