Will Bondo Cure Without Hardener?

Without it the bondo won't get hard. Put a small piece of bondo on a board and run a line of hardener from end to end. It will take about five minutes to mix it up and apply it. If it starts tacking up, stop applying it or you'll mess it up.

Does Bondo need hardener?

How Much Hardener Do You Add To Your Body Filler? You need to be sure to add the right amount of hardener to your Bondo; adding more than enough will cause your body filler to dry faster and give you less time for shaping and laying your filler on your panels.

Will epoxy cure without enough hardener?

Too much or too little hardener will affect the cure time and thoroughness of the cure. A. Remove the uncured epoxy. ... DO NOT add extra hardener for a faster epoxy cure!