RE: monokote hinges
As a further data point, I agree with majortom.
I have used "covering" hinges on my last 5 40-60 size planes. (Over the last 24 months)
2 were done with Monokote, 3 with Ultracote, using the same assembly technique.
The Monokote hinges started failing only after a few outings.
The Ultracote hinges are still going strong after hundreds of flights, and a few minor crashes.