Honeycomb inside cowling edge ?

[hevansrv7a]

When I was first looking at using Camloc style fasteners, I came across a product that was a thick, light material - honeycomb, I think - to bond inside the edges of the cowling for stiffening. Now, I can't find it. Does anyone recall seeing it and know where it is or where it went?
THANKS
h

[Davepar]

I haven't installed my camlocs yet, but I was thinking of just making a ridge with fiberglass about 1" from the edge of the cowl. I don't think it would take much to stiffen up the cowl between the fasteners.