When you get to trying to finish the shape with the Bondo, I have something I have found works well.
If you take one of plastic spreaders, you can cut a collection of slight notches in the edge, similar to what you would see on a glue spreader for linoleum or tile. Then using that edge, take the Bondo and create your surface, using the notches. This will give you a surface you can sand fairly easily, using a sanding block and sandpaper. After you get this surface to the shape your looking for, then you can take a regular spreader and fill in the gaps.
This makes it vastly easier to work, compared to laying a full layer of Bondo down. It does not seem to make any difference in the final appearance or durability. This also makes it easier to do a thicker fill, like over 1/16 of an inch or so.
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