"I would not use Dual Lock for most spray cover applications. Next DIY cover will use only snaps, spaced 12” or so apart."
I appreciate this. I was seriously considering trying a dual lock cover.
Moreover, I did not use the prism spray cover much, in large part because of the fuss. Spacing at 12", as opposed to 8", would significantly decease the fuss so probably I would use it more. Enough to justify doing it in the first place. I will gladly trade greater ease of use for potential but very unlikely wave overwash spray cover implosion, due to the way I would be using the canoe.
Still tying to find spare time to tackle the magic spray cover project.