My old van has a beige type paint finish. It is becoming pale and is powdery to the touch. for example positioning on site means a bit of shoving to/fro -when done my had have a powder like coating which seems worse if it's wet.
Now is there any way to neutralise whats happening?
If no other replies then check out with local caravan repair shop or contact manufacturer. There may be a stablising solution you can use then repaint over.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix caravans/motorhomes.