A few comments. First, box sealing tape is the WRONG choice for this area. The open pores of the foam allow epoxy to creep underneath the tape, where it sticks to the adhesive. This makes it very difficult to remove later. I don't have a great solution to this, actually, but at the very least use a thicker tape, like duct tape. Box tape tears when you take it off, and makes a godawful mess. I didn't want to leave any of it around, so it made for a lot of tedious sanding Second, add a squeegee step an hour or so after you finish the layup. I had my spar cap on the left wing squeegeed perfectly level with the top of the trough. The next day, though, I discovered it had uncompressed slightly. It wasn't a huge rise, less than 1/16", but it made for a heck of a lot of sanding to bring it back to level. Better slightly low than slightly high - it's a lot easier to fill a slight outside skin depression with micro than to fair the entire wing into this area, and if you squeegee low, at least all the spar cap tape is there, and you aren't sanding any off. Finally, PROTECT YOURSELF. I've sanded quite a bit so far, as you might imagine, but I never had a problem with it. I generally used the Fein, and was doing small areas at a time, either to rough up prior to a layup or to remove epoxy drips and the like. I'd get an itch or two, but was pretty careful, so it was never more than a minor irritation. This time, whoah! I used the belt sander, and while "less than 1/16" doesn't sound like much, multiply it by the length of the spar cap, and you have a lot of fibers being removed. This stuff is VICIOUS. I probably would have been fine sanding - I got some dust on my hands, but not much worse than that. I wear a shop apron to protect my shirt and pants, and haven't had any issues until now. This spar cap stuff is MEAN when it's sanded. It produces long individual fibers that stick to everything. I was fine until I went to vacuum. The static from the vacuum pulled the stuff all the way up onto my arm. I've been itching all day, and probably will again tomorrow. Use protection! 11/16/2005 (2 hours): More careful cleanup. 11/17/2005 (4 hours): I got a little fed up with making aluminum parts piecemeal - sanding, alodining, etc. were all slowing me down because of the time involved in breaking the tools and chemicals out and putting them back. I thus spent some time making all of the aluminum parts I needed for the next month or so, which include the four seat belt brackets for Chapter 8, and all remaining LWA1-LWA6 pieces (three were already made). They're now alodined and ready to go. Hopefully this will save me some time in future steps. The only thing I didn't make was the right wing's LWA18 cover plates, because I found it was easier to make these a little oversized and trim after trial fitting them. Getting the bend just right on the very end of the piece is tricky, so I just make it an inch further in, mark the exact edge where it meets the wing surface, and trim to that point. No point making and alodining something I'm just going to cut up...