Robson Mastic RT10 is a latex/rubberized compound traditionally used to seal cement that is under ground or to seal steam pipes and pipe insulation. It will always stay pliable, never freeze, and will not crack over time. It is easy to apply and dries quickly, meaning you can paint your canoe in several days as opposed to traditional canvas fillers that are oil based and can take up to six weeks to dry. White - 4L pail. Once paid, there will be an instruction sheet to download best use of the product.