Here's how to glue up a scarf. Overlap the scarf and nail a tack strip through both sides of the scarf and into a backing board -- making sure that it is something that won't be glued by the resin.
Problem is, it's 30 degrees out and the resin requires 75 degrees to cure. It will cure as low as 55 degrees if it is mixed with extra hardener, but the only place to glue up the plywood sheets is on the floor, which is colder that 55 deg. So I had to build these heat tunnels over the joints and pipe heat from small electric heaters over the joint. It would've worked except one heater quit working right then. So I heated one joint for an hour, then the other, but the second one didn't cure for and hour and as a result, all of the resin soaked into the wood, which caused the joint to fail due to being starved of resin. Once again my failure to butter each of the sides, wait 10 minutes, then butter again and glue caused failure. I skip that step because of a limited pot life of the resin. I'd have to mix up two batches . . . I'm lazy and short cuts.
Picture of the failed joint later.
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