Another day sadnnig and filling the cabin cover. I did this routine about three times, then starting progressing to the finer grit sandpaper, and a couple blisters popped up on the overhead. It took me two interations to get these blisters filled. The next session, I'll re-sand with 400 grit paper and apply wonder-fil for pin holes. This starting to get old and I've got several weeks of these type of projects in the queue.