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Depends on what youre filling. Are you filling spots on a helmet or large gaps in something? Bondo is essentially made to stick to metal and fiberglass, its a automotive products after all.


Here are some alternatives:

PC-11 Marine Epoxy

PC-7 Epoxy (both available in the glue/epoxy section of Home Depot)

Squadron Putty - white hobby putty/paste, dries hard

Apoxie Sculpt -  2 part sculpting putty, can be sanded and sculpted

Zap Finish Resin


All great products, you can google them, find them at pro-level - R/C hobby shops, etc.


I use them all, for different needs. Heck used them all on a clone armor build, all is seamless, most of them I smooth out with water after putting them on, less sanding and better "seamless" results.


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