I've built several s&g kayaks, which have been very successful, structurally & design. However I only attempted scarfing ply on the first. A couple of the scarfs failed during building, so I backed them up with a ply strip epoxied across the inside of the join, which is what I did with subsequent boats. Not pretty, but strong.
Is scarfing such thin ply practical, and does anyone have any ideas for prettier scarfless joints?

The other problem is that when I cut ply with a power jigsaw and fine toothed blade, the surfaces are damaged along the cut with lifted fibres/splinters which have to be sanded off.
I'd appreciate any ideas for clean cuts on ply.

My first visit to this excellent site, can't understand why it took me so long.