The Resene Colorshop Undercoat White 10Litre is a great choice for flat gloss level finish. It has drying time of only 30 minutes and provides coverage of 12 square meters per litre per coat.The Resene Colorshop Undercoat White 10Litre is a great choice for flat gloss level finish. It has drying time of only 30 minutes and provides coverage of 12 square meters per litre per coat.