I have been using RC airplane “canopy glue” for this purpose for most of my term as a BAR (such as Pacer Formula 560). Recently, however, I’ve seen the recommendation of Beacon Fabri-Tac (from hcmbanjo, in particular). While I have not yet used it, I HAVE used a similar product, Beacon Foam-Tac, and it is working well. For field repairs, medium CA works.

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Bernard Cawley
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