Dust contamination does not affect cure but may cause "fisheyes" and pinholes in the hotcoat. Additive F helps prevent fisheyes but in addition to wiping the lamination down with Deatured Alcohol and keeping your hands off it, you can lay the hotcoat down and walk away to give it time to self-level. If you check on it 20 minutes or so later and see any separations or pinholes in the hotcoat you can lightly rub the area with your finger to connect the resin back together.