How to remove bondo from fibreglass?

If it's rubbery, then just scape it off with a chisel. The fiberglass is much harder than the uncured bondo and won't be affected.
 
Acetone will remove bondo if it is not cured yet.You can also thin bondo with acetone to brush it on . Important note: Bondo is polyester filler, if your helmet is polyester resin and the surface was sanded before applying its a permenant bond because they are the same material. As the other posts indicated sanding is the only way to remove it.


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