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holy cr*p those things look beefy  foam filling?
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They are already foamed. The previous owner cut the tops of the stringers off, then over filled them with foam (at least 6lb from what I can tell) then shaped them and covered with one layer of 1708. In the rear where the original stringers take a bend towards the sides and narrow, he just made them full height all the way back to the transom. That is fine, but they were only covered with one layer of 1708. Box stringers must be thicker the taller they are. These should be about 1/4" thick, so in the places where we have only one layer 1708, we have added 4 layers of 1810. Its a total pain to wet out that thick of cloth with epoxy, but it makes the job go quick.
After building the required thickness, i will re-tab the inside of each stringer. There are no signs of delam, but the glass job was not the best, so for peace of mind Im going to re-tab.