Epoxy Bonding


I am working on a homebuilt airplane. The wing ribs are .250 inches square (spruce) and are laid up in a truss arrangement. The truss joints are reinforced with .062 inches thick gussets (birch plywood). The gussets will be glued and clamped to the spruce.

I have modified c-clamps that I can torque to achieve thickness layers in the epoxy of .0005 inches and up.

I read somewhere that the epoxy thickness should be .004 to .006. This seems kind of thick.

Any feel for an ideal thickness?

Also, I am abraiding both parts. Should my abrasion lines be perpendicular or parallel to the loading?

Thanks, John Burnett

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John Burnett
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