On Nov 10, 6:16*pm, wrote:

The Wortmann FX67 series airfoil coordinates are available.
That said smooth and refinish is the most practical solution.
Worth noting, just to confuse you, is that this series of airfoils is
very sensitive to leading edge shape.
Most have been sanded too round.
If you're flying it for fun, don't worry, just enjoy it.

What Hank said. The FX67 family of profiles, especially in the thicker
variants like around 17% (for example the FX67K170), are sensitive to
contour at the very leading edge, and are very sensitive to
contaminants (bugs, rain, chips, dings, and especially paint orange-
peel) across the entire surface back to the point of max depth.
Unfortunately, the commonly-available FX67 coordinate sets do not have
the abundance of data points that many other profiles have, so the
contour in the tightly-curved leading is somewhat open to
interpretation.

Thanks, Bob K.