For brush/roll applications, you can use alternative thinners such as Epifanes Brush Thinner for One-Part Paints, Interlux 333, or Pettit 120. But understand that each of these solvents will give the paint slightly different working properties than TotalBoat Special Brushing Thinner 100, which is formulated to give TotalBoat Wet Edge paint ideal flow and application properties.