The tips delivered by Murphy were really of minor quality. They did not fit properly and putting them together left a big channel in the middle. I decided to rework all tips. With the help and instruction by friends from the glider club, Martin reworked them. After sanding the black covering coat did 3 different stages with resin and a lot of sanding in betwwen. The outcome in the end were nice tips. Just need to prime and paint them.