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Found 1 result

  1. My old apprentice master taught me to use Resorcinol when constructing wooden airframe assemblies, but that was years ago, and glue technology, like everything else has progressed. Now we have the two-part epoxy glues and the straight from the glue pot polyurethanes. I'm not going near PVA glues. Resorcinol is a 2-part glue, making high strength bonds, but is not gap filling. Since it is not gap filling the contact surfaces to be glued together have to be near perfectly fitting, which means that cutting of mating parts has to be as close to perfect as possible, and the parts have to be clamped hard during curing. Here's some info about its pros and cons: https://www.christinedemerchant.com/adhesive-glue-resorcinol.html Epoxy is also a 2-part glue, making high strength bonds and is gap filling. As with Resorcinol, the two components must be mixed in the correct proportions for complete setting of the glue compound. The strength of bond formed is dependent on the formulation of the resin and hardener - probably the factor which affects the price. Since epoxies are gap-filling, the accuracy of fit of components is not as critical as with Resorcinol, however, moderate clamping of the joints is necessary to reduce the width of the gap. Polyurethane is a one-part glue, making strong bonds, but a good gap filler. It is not as strong as epoxy in wood-to-wood joints, but making bonds that are stronger than the wood. Like epoxies, the formulation can be dictated by price. Apart from the need to have close-fitting joints, care must be taken to prevent foaming of the glue which occurs in damp conditions. Although the foam might appear to be filling gaps, the glue joint is weaker than where the glue has not foamed. Here's some guff 'n' stuff about polyurethanes https://www.christinedemerchant.com/adhesive-glue-polyurethane.html So, what type of glue would you recommend now for airframe construction?
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