Q4 White liquid shading agent High quality shading paint for use on glass and plastic surfaces. Reduces influx of light and heat into the greenhouse. In rainy weather this effect is minimal. Biodegradable and easy to apply. Q4 is especially advised in climates where high radiation sunlight is combined with frequent heavy rain showers. As a liquid it is easy to dilute and solution can be applied with professional spraying systems. Q4 leaves a homogeneous protective film which holds for months. With the use of REMOVIT it is easy to remove.