Bumper Help

Well I was leting my older brother drive my truck lastnight cause mine had more gas and when he comes home it had a fucking huge scratch on the front bumper and my bumper is that plain gray metal. I tryed to buff it out but no luck and I tryed to uses that black wax to cover it up before my dad finds out and gets all pissed. I need to hide it for about two weeks untill my mom can get time to get if fixed. So what can I do to cover it up some it dosent have to be a perfect match just somthing to get rid of the white cause my dad dosent have good eye sight.....Also how much would it cost to paint it blue to match when I get it fixed.