Edge Select direction

You could try as I've done below:

1.Bake Curvature and Position maps from your mesh

2.Use Edge Select to select the convex edges.
3. Blur those edges 'downwards' using a Slope Blur Greyscale driven by the Green channel of the baked position map ( I used two in series so I got more blur without introducing artifacts
4. Use that to drive the mask input of a leaks node (also with inputs from the curvature and position maps)

Dave

How can I make node leaks only work on convex edges?

thanks