On Wednesday, November 11, 2015 at 3:15:39 AM UTC+1, Jonathan St. Cloud wrote:
Any idea how much weight the urethane paint option adds to an 18 meter glider?

I repainted my Ls1 wings last winter. I removed about 10kg of gelcote, then did I added about 6kg of primer and PU-paint.

Regarding the odd color on the LS3, I had the same on my LS1. On the first LS-gliders was the gelcote and fiberglas laid wet-on-wet, which made the gelcote and epoxy to be mixed. That mixture has an cream/yellow color and penetrates into the first layer of firbeglass. Do not grind though this as it would genereate a lot of extra work by adding a new layer of firbreglas.