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I think just about everything to be said has been covered here already.
When I did the deck repair on my 6.9 I used a high speed grinder to remove the inner skin. It was very effective but VERY messy.
I did a ton of deck repair on my 9.1 last year. I swear by the Fein Multimaster for fiberglass work. It is an incredible little tool. It's considered a detail sander, and it is a very good one, but it's best use is as a detail saw. Because it vibrates instead of spinning it does not through dust or get unweildy. You can cut a very thin kerf at a controlled depth in fiberglass freehand. It is so neat and quiet that one afternoon some friends stopped by the boat to visit while I was working, they sat in the boat and ate their lunch while I cut away at the underside of the deck a few feet away. What I do with the multimaster is cut a grid pattern into the skin making a bunch of 2"x2" squares. Then I just pop off the squares with a screw driver or putty knife.
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