"Sonny" wrote in message
...

Use a 3/4" aluminum angle as a fairing batten. The knife edge of the
aluminum angle will leave black lines on all the high spots so you can use
the long board to knock them down. Lew

I like that tip. I never thought to use an aluminum bar for that kind of
marking.
Sounds a lot easier than trying to eyeball dips and highs, from a side
viewing with a straight edge, and, then, trying to marks the spots exactly.
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Should work for at least the first mark. After that, the oxide on the
aluminum wears off and it no longer makes a mark.