[DanEC]

I don't know - yes, fiberglass does tend to move some over time, but that washboard appearance looks typical of the difficulty in color sanding the paint flat before buffing in a tight valley area. The few cars I've painted myself have some of that in the valleys. It's easy to board and stick sand flat or gentle curved areas dead flat, but in small radius valleys I have to resort to round rubber blocks, sanding pads, pieces of round swimming pool floats or what ever I can scrounge up that can conform to the curvature. But, these are usually soft surface sanding aids and it's difficult to get those areas absolutely straight and ripple free as a a result. Possibly they have always been there but you have only begun to notice them recently. You might talk to a good custom paint shop and see if they think they could sand and buff those areas again - depends on how much paint is on the car.