随便做油漆的英文表达是"to paint haphazardly"。这个短语源自英语动词"haphazard"，意思是"随便的，任意的"。例如：

He painted the walls haphazardly, without any regard for symmetry or precision. 他随便涂漆，没有考虑对称或精确性。
She haphazardly appped the paint, leaving drips and streaks all over the canvas. 她随意地涂漆，在画布上留下了滴水和条纹。
The haphazard apppcation of the paint made the finished product look sloppy and unprofessional. 随意涂漆使得最终产品看起来马虎而且不专业。