I used it to secure the push rod tubes in a stick plane that I built. Shot some of the foam in at 3 different places, it foamed up and dried. The push rod tubes were totally secured. Then I put the top sheeting on. As the others have said, use sparingly because it will expand like crazy. I had a crunched wing on a profile plane (in the d tube part). The foam was injected into the cavity and it pushed everything back into place. Cut the excess that oozed out and recovered the bottom.

I knew beforehand how to use the product and have had good experiences with it.