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 Do I need to apply a primer over gelcoat before applying antifouling bottom paint? Can I apply TotalBoat TotalFair over gelcoat? Will TotalBoat Thixo adhere to nylon? Can metering pumps be left in epoxy containers when not in use? Which spray gun nozzle size should I use to apply gelcoat? Comments 0 comments Please sign in to leave a comment.