Thanks for the replies. The drywaller did a good job initially, but these are replacement skylights 14 years after the build, so it was the skylight installer's only option as the new ones did not fit in the same way. I agreed to his option, only I would have cut a little straighter :), but thought it would not take me long to trim it up. The quarter round idea is a good one, but the size of quarter round required would cover too much of the skylight. I wasn't sure if I was just having a senior moment not being able to figure it out, but now that you mention 2 planes Billy, I understand the difficulty now. I'll take your advise and see what I come up with. Thanks to all.