Same here. Brand-new prop in 2010 shed paint in less than 5 hours TT very badly. After a lot of complaining I got them to repaint it at the local distributor/prop shop under warranty with the same result. After a LOT more complaining I got a new set of blades (which turned out to be overhauled, not new) to replace my <100 TT blades that shed paint twice. The replacement blades used a standard color (white with black tips) vs. my original custom color (white with maroon tips) and they have held up better, but are starting to lose a little paint from the edges.
The root of their problem is an extremely poor design choice, and I even requested they change for my replacement blades. I 100% believe the structural design of the blades is great, especially the replaceable stainless steel leading edges. What they did wrong is to install the edge, then apply filler behind it and carry the paint over the joint and onto the stainless steel. NOTHING sticks to stainless steel. Even worse, they leave an exposed edge aimed right at the airstream and even if paint stuck to stainless steel, it will eventually erode no matter what. I requested they paint the blades first, then put the steel over the paint and that configuration would last result in no paint erosion. Obstinate Germans don't see it that way, though.
Love the prop, hate the paint issues.