our club seems to have a flock of these 4 star 60s ( I love mine!) some are covering the T deck with very thin ply and shooting a little "touch and foam" in for stiffening. works fine just let the foam harden over night and put in just enough ...it DOES expand!
easy to remove slight excess amount AFTER it sets up completly with a serated steak knife....JUST be SURE to return the steak knife to the kitchen lest your wife will stomp your plane!!