Posted for Charlie & Tupper England <cengland@netdoor.com>:


IIRC, 'Great Stuff' aerosol insulation foam in a can is urethane foam. For non structural stuff you can spray it in place & it's relatively easy to sand. Available at your local Home Depot or other a/c supply store.

Charlie


(Only problem with "Great Stuff" is that it's a very low density foam (<2lb/cf) and it doesn't really harden up.  Fiberglass supply houses sell the same thing in mix-it-yourself containers as 2-part urethane foam.  I've used it extensively on this Lancair IVP in the 6lb/cf version (density is determined by the catalyst used) to create shapes in places with compound curves where it was too difficult to attach some other kind of foam core sheet material.  I also used it to help a guy with an RV9 to build the part that seals the bottom of the cowl to the fuselage... he had worked on compound bending up some aluminum to do the job for a few days and wasn't happy with how it was turning out... we built a dam on the fuselage around the bottom of where the part was supposed to go, applied release tape to the canopy down to the dam and filled it with 2-part foam.  Went out for a sandwich, came back 1/2 hour later and sanded the foam to shape, applied the glass and he was doing the final body work that evening.  Amazing stuff.    Anyway, for these couple of cowl bumps, styrofoam is still the answer IMHO.  FWIW.....   <Marv>              ]