The blue portion of TotalBoat TotalFair Epoxy Fairing Compound has a thickening agent that can become gritty. When properly mixed with hardener at the correct ratio, it should soften to a smooth peanut butter consistency. If the mix appears gritty, spending more time mixing can help to eliminate the gritty texture. To avoid grittiness in the mix, store and use TotalFair at room temperature.