Make sure the base coat has thoroughly dried before applying the topcoat.要确保底漆干透后再刷面漆。The alternative approach is to allow the base coat to dry out slowly and start to carbonate.另一种方法是让底漆慢慢变干并开始转化为碳酸酯。He paints a base coat, allows it to dry, and then adds layers of paint.他刷上一层底漆，晾干，然后又在上面刷了几层漆。