Here in Part 2 of his series on Bondo basics, industrial designer Eric Strebel shows you how you can use polyester body filler to go straight from sketching to hands-on, to create complex 3D forms for prototyping.

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If you don't have access to a 3D printer, or prefer the tactility of shaping an object by hand--as all designers once did--this is a great way to go, as you can make changes on the fly without having to edit the file and wait for the print all over again.

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Strebel also gives you a bunch of his signature tips, from the application of glazing putty, to how to form smooth fillets, to using Bondo to bond Bondo to Bondo (never thought I'd type that!).