The Konig crystal white profile touch up pen contains 11ml of opaque acrylic lacquer which is perfect for colouring unappealing mitre joints on white window frames. With a new specially designed tip, this pen can be used for a wide variety of jobs. These pens are perfect for touching up edges on window frames that might be discoloured, light scratches or for seams that need to be coloured. The valve system on the pen allows the user to have total control to ensure an accurate lacquer flow for the right application. These pens can be used indoors and outdoors and provides an excellent adhesion to uPVC, wood and metal surfaces.