Berger Triple Prep Oil Based is a multipurpose preparation paint for use on interior and exterior surfaces to undercoat, prime and seal a surface. Berger Triple Prep Oil Based is ideal for use over aged enamels, laminates, and over pre-painted surfaces where a water or an oil based paint has been previously used. Berger Triple Prep Oil Based blocks water based stains, and has superior tannin blocking properties to prepare surfaces for painting.