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If you are just looking for a gap or opening filler as a temp backer which can be pulled out after glassing, how about some large sponges form the dollar store?
Cram them in there, and pull them out of there when done. It should tear off the outer layer of sponge.
I have not tried this myself, but have been thinking about it.
Expanding foam insulation, I've used it and now try to stay away from using it - long story. It can be a disaster, enough said.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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