Perhaps the dark green lines are the center of the spreader. IF the product is tacky, or the humidity is high, the material is sticking on the spinner too long and hitting the backside of the unit making it fall straight down. Or it could be adjusted wrong to where it's intentionally being dropped too far in on the spreader and doesn't have enough time to get off the spinner before it makes a revolution before 3&9 (without hitting the machine.)
Looks more like unintended overapplication rather than improper overlap. It's a pretty thin line. If you look at the first picture the dark green line starts close to the sidewalk on the right, pretty much where he would be doing a perimeter pass.
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Last edited by Raymond S.; 12-12-2012 at 08:03 AM.