Using a brush or applicator size no less than 1/2 the pipe diameter, apply a liberal coat of primer with a scrubbing motion to the fitting socket until the surface is softened and semi-fluid.

• 采用的刷子或涂敷工具不要小于管道半径，要在管件承插部位通过来回刮擦运动涂敷足够量的底漆，直到表面软化并且处于半液状状态。