Quite often expanding polyurethane foam can be very useful in our birds. Holding fuel tanks in place, securing long extension wires, and "backing up" thin-shell structural areas are just a couple of these areas.

Recently while visiting with Rep. Tom Rausch at his lumber yard he introduced me to expanding foam in an aerosol can with a long thin tube for applying the foam. This stuff is neat! Just wherever you want some foam, shove in the applying tube and squirt. The brand Tom showed me was Polycel One, but I'm sure it is available all over in different brands.

Just a couple of cautions, guys and gals. When filling a closed area, go very gently. This stuff expands quite strongly, and if you squirt in too much, your structure will probably look like a balloon about ready to pop! Second, this stuff is great fun to use, but it does have some weight if you get carried away. Use only the bare minimum you need to do a job.