The vitrail lightening medium is available in 45ml and 250ml bottles * The vitrail lightening medium mixed with vitrail colors is tack-free in one-hour, and fully dry in 8-hours if led in thin coats; air dry only as the colors are solvent-based * The vitrail lightening medium mixed with vitrail colors can be applied on glass, polyester, acetate, canvas and metal using flat or fan brushes * The Vitrail colors may be thinned using Odorless mineral spirit or white spirit; Clean brushes using odorless mineral spirit or white spirit and rinse with soapy water * 48 hours after drying, the vitrail colors bear a light wash without soaking and are resistant to glass cleaner; objects decorated with vitrail colors are intended for decorative purposes only and should not be considered for practical usage