Prepare materials and surfaces for folkart milk paint with bonding primer and sealer this fantastic primer also doubles as a sealer so you can add a layer of protection to your colourful paint the water based primer will allow any colour of milk paint to adhere to a variety of materials including metal and glass as well as painted and varnished surfaces it provides a smooth basecoat that will ensure even colour when milk paint is applied the formula also acts as a sealant so you can use