Ulano 10 Blockout Liquid - BlueUlano Heavy Blockout No. 10 is a heavy, non flammable, water soluble screen filler with drying characteristics similar to indirect films. The high viscosity of Ulano Heavy Blockout No. 10 affords easier handling and generally assures effective coverage in a single coating. It is especially useful with coarse mesh. It can be used for touch ups when thinned with cold water. Additionally, it can be used in unventilated rooms since it contains no organic