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I did not back the Bondo with anything. In small quantities, Bondo is about as flexible as the Zenith mask is. Basically, I forced a blob through the back of the mask, struck the excess level off of the face of the mask, and let it cure. I gave it the "twist test" and the Bondo stayed put. But to be safe, I pulled the whole piece out, and glued it back in with either gel superglue or gorilla glue (I forget which). Bondo tends to stay together in one piece (which is why auto restorers dislike it, as the whole fill piece will eventually fall out, making an ugly wound in the car) so it can be pretty easily be removed from the work piece as I did and still be a perfect fit later.
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