When I do an epoxy layup where I expect to add something later that's going to make a secondary bond, I wet in a layer of peel ply over the last layer of glass. The amine blush peels off with the peel ply, and it leaves a surface that's ready for a secondary bond with no sanding. To me, the time savings is well worth the minimal cost of the peel ply.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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