[loyal]

Last year when in Maine I was told by the inspector that duct tape is not allowed but there is nothing in the rules about using safety pins. So if in a bind use safety pins to attach fabric to your bumpers.
Our team has reversals bumpers and when done correctly you won't see any of the wrong color. Just look at the way the material folds to cover the ends you can figure it out. Make a sample bumper then take it apart and use it as a pattern. When you get it right save the pattern for next year.