Anonymous wrote:
Great progress Frederik, I'm also watching very closely. Are you glueing the two layers of plywood together with (lots of) epoxy? I've wondered about using a PU (D4) glue for this, it's cheaper and gap filling and it's probably what the ply is made from but it may be impossible to work with big sheets of ply fast enough and it won't seal the ply as well as epoxy. Anyone else have thoughts on this?
Also, I'm intrigued by Chris Morejohn successfully going against all advice I've ever seen (including his friend Reuel Parker) and using polyester resin over plywood. Any thoughts on this?
I've used Collano Semparoc 60 between the layers of ply. In case you don't already know, it's a PU expanding, waterproof adhesive categorised as C4. As I understand it, C4 is probably more suitable than D4 as the C group are thermosets and the D group are thermoplasts.There is no problem time-wise with gluing up big sheets; the working time is perfectly adequate.
Anyhow, so far, I'm happy with the results - it certainly seems to stick well!. Unfortunately the boat isn't in the water yet, so I can't tell you anything about long-term performance...