I had this question not too long ago running through my head so I decided to give these hinges the test.

I got a couple of scrapes of wood(about the size of a trailing edge and an aileron) and hinged them together with the ca hinges. I found that 2-3 drops worked just about the same as 4-6 drops when I gave it the old pull the two pieces apart test. These hinges really hold! They will tear out pieces of the wood slots when they decided to give.

Try this test and find out for yourself, you'll feel a lot more confident about ca hinges afterward.