How thick can TotalBoat Polyester Structural Repair Putty be applied? Eric Boudreau June 29, 2021 15:26 Updated There is no maximum thickness for TotalBoat Polyester Structural Repair Putty. The amount of MEKP catalyst should be proportionally reduced for larger masses and thicker applications to prevent the reaction from building up excessive heat. Related articles Can I apply TotalBoat TotalFair over gelcoat? Will TotalBoat Thixo adhere to nylon? Can TotalBoat Polyester Fairing Compound be used below the waterline if top coated with gelcoat? Do I need to apply a primer over gelcoat before applying antifouling bottom paint? Can TotalBoat Polyester Fairing Compound be thinned? Comments 0 comments Please sign in to leave a comment.