First time using styrofoam glue for my RC planes. The glue worked very well. It's a clear liquid, very fluid, like water. It grips well and after 15-30 seconds (holding with hand) the pieces will stick together by themselves. They're welded together in a minute or two. Just be careful not to apply too much, use a small watercolor brush to evenly wet the surfaces. Have a paper tower ready if you go over the limit. If the glue gets on the outside of the plane where there is paint, it will dissolve if not wiped off immediately. So it's foam safe (won't corrode the foam), just don't put it where it shouldn't be. And be careful not to get on the skin - glue together immediately.