The preferred spray thinner for TotalBoat Wet Edge is xylene (brand name, Xylol), but if this product is not available, you can use Interlux 216 Special Thinner, Pettit 121 Spraying Thinner T-8, or Epifanes Spray Thinner for Conventional Paints and Varnishes.
Do not use brushing thinner to spray TotalBoat Wet Edge, it will not provide the needed thinning properties and flow for spray application.
Do not use any other solvents, or solvent blends to thin TotalBoat Wet Edge.