TotalBoat Halcyon can be applied over TotalBoat TotalGold, only if the TotalGold material has been able to cure for at least 5-7 days under normal curing conditions. Lightly scuff the TotalGold and any other substrate that the Halcyon is to be applied, using 320-grit or 400-grit sandpaper, and remove any sanding residue prior to applying Halcyon, as directed.