Do you laminate both sides of the board at once and do you sand before the hot coat or after

Laminate the bottom first, let it cure, then do the deck. Hotcoat top, let cure. Hotcoat bottom, let cure. Install fin boxes (If FCS X-2, FACTORY plugs, or longboard center fin box. let cure. Sand the board.

Read through the glassing section of the surfboard building guide before you start glassing to help you out.