Well I have to disagree with the expert finishers that thought what I had was blushing, or trapped water vapor. The reason I called it blotching was because it just didnt look like blushing. Blushing has no grain or texture to it, just makes a painted surface look dull or hazy that would otherwise have a gloss. I could tell that this was something that formed and was trapped on the surface of the balse and under the covering. I could see it had a texture. What I did today was take a mixture of 10oz straight thinner and 1oz retarder. I wet the surface (pretty much flooded it) and watched and as soon as it started to dry (about 15 sec) I wet it again. Repeated 3 times and at about the 45 sec point I could see the blotches start to melt away, or dissolve back into there original clear state. I did the wing first, got rid of about 95% of the blotch. Then I did the fuse. Because it was flat I was able to flood it more so and kept it wet for almost 1.5 minute. Completely cleared the blotches. Then I noticed that there was some of the white stuff on the edges of the fuse where there was no covering, nothing to keep water vapor trapped. If it was water it would have evaporated, it had been there almost 2 days now. So I could now check it closer. It was a powderey substance, and a little on the gummy side. I could scrape it off with a hobby knife, or sand it off, now that I had access to it. One thing for sure, it was not water vapor, you can see that in the pictures..