Turbo Builders Bog Turbo Builders Bog filler is a repair filler especially for builders and painters – It’s Like Wood In A Can! Mix together the two supplied components, following the instructions about the correct amounts of each. The amount you mix and the proportion of red hardener can vary to suit the job and the speed of cure you want. But it has to stay within the allowable range as written on the tin. As it sets, Turbo Builders Bog passes through a stage like balsa wood, when it can easily be trimmed with a blade or surform file. It then continues to harden and lose its tackiness until it can be rapidly sanded with 36 to 80 grit paper to its rough shape before finish sanding and painting. All done within the hour if you wish! The Turbo Builders Bog formula contains cross-linking agents to attach to the cellulose in the timber, which gives a more tenacious bond than normal adhesives, and the subsequent flexibility of the Turbo Builders Bog allows it to remain tightly knitted to the timber as it undergoes its normal expansion and contraction.