The normal Green Stuff is a bit of a pain to mix up and work with so I gave this a try. Maybe a decent product for filling very small imperfections, but anything larger than a pinhead, this stuff is pretty worthless. Filled a hole maybe 1/8" square, 1/16" deep with the intent to drill a new hole for magnetizing a model. It shrinks so much, it took 4 layers to build up enough that it wouldn't leave a dent. 24 hours later, it's still soft enough I could move it around with a fingernail. Definitely not ready to drill after a day? Bondo sets up in a few minutes- yes, it's not ideal, but at least it works.
If all this is good for is filling tiny imperfections, a bottle will last you a lifetime...assuming it doesn't dry up on you.