Understanding Aircraft Composite Construction by Zeke Smith. The book is recommended to
anyone who is interested in Composite Construction, airplane, boat, or other.
I bought the book, read it, and enjoyed it. Thank you.
In this book, there is a discussion of resin. Apparently, there is bonding
resin and finishing resin.
Bonding resin is used as the base coat or the intermediate coat in a
multilayer laminate. It remains tacky at the surface, and this is considered a useful
property for laminating. There are two theories as to why it remains tacky.
One is the catalyst evaporates, and the other is the resin is hygroscopic and
draws moisture from the air.
Finishing or surfacing resin has wax added. As the resin hardens, the wax
comes to the surface, seals the resin, and permits it to harden.
I too have noticed that the unpainted surfaces under the front and rear
berths are tacky. This explanation seems satisfactory to me, and I would not be
concerned about mis-mixed resin and the structural integrity of the hull based
on tackiness on the surface. If there is a puddle of fluid, it is more likely
water, not uncured resin.
Todd Olsen
F-27 Raptor #164
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