Pinch some from a car with painted bumpers!!!
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![Embarassed :oops:](./images/smilies/icon_redface.gif)
Wash and dry bumper (important to dry thoroughly). Using a gas torch (the type used for soldering) on a medium-ish flame, just pass it over the bumper surface a bit quicker than you would if spray painting and only about 3 - 4 inches from the surface. It only takes 5 - 10 mins to do the whole bumper and it'll look almost new. It needs doing every 6 - 12 months but it's quick, cheap and effective. N.B. If the bumper isn't dry, the water can boil off and leave marks in the surface.
It may not suit you purists out there, but my BX is a little rough and ready and it does make a big difference. Hoping the above is useful...
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)