I wrote:

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
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"Sonny" wrote:

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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I have a couple of angles I use for battens.

A 3/4"x3/4"x1/16"x 96" aluminum angle for compound curve surfaces
and a 2"x2"x1/8"x96" aluminum angle for flat surfaces.

The 2" angle also serves as a straight edge guide for hand power tools
such as a circular saw, jig saw, etc.

Lew