I've heard that abrading the surface of a cured epoxy surface before
using epoxy to glue another piece on makes a better bond than not
abrading it. More "tooth" for the epoxy to stick to. But you're
asking if such an abraded epoxy bond is stronger than a bond directly
between one wood member and another wood member, right?
If both surfaces are equally rough, to provide the same "bite" for the
epoxy, then I suspect the bond strength will be the same at the joint.
I saw a report once that claimed the "penetrating power of epoxy" in
wood was very slight, so that you are really dealing with the surface
bond with wood, just as you are with an epoxy-to-epoxy or epoxy-to
If the designer is available, you might ask him. It could be that
part of his design requires glassing the bulkhead in place, with
fiberglass tape and a fillet along the mating edges. I think in that
type of construction, the bulkhead could be pre-coated without ill
>Is there a significant difference between attaching another piece of
>wood to wood that has already been epoxy glassed and rough sanded?
>I have bulkhead that will have more pieces attached to it, however I
>would like to pre-glass it and rough sand it before I install it, and
>I'm wondering if that will decrease the joint strengths down the road?
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