On Tuesday, November 17, 2015 at 7:50:39 AM UTC-7, Per Carlin wrote:
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.

Thanks, between your answer and that of UH, I think my question regarding the odd contact layer has been put to bed. I didn't realize that the fiberglass was layered into the mold on top of wet Gel.

I still haven't made a decision on brand of primer and PU paint to use. I'm curious to know what you used. Regarding the PU paint, there seems to be a consensus on PPG Concept, but it is absurdly expensive around here ($450 a gallon. Regarding the primer, I've seen many mentions of "PCL polyprimer" and on the car business side of things "Evercoat Slick Sand".