Now that you've watched Part 1 and Part 2 of the Bondo tips series, here's Part 3, which industrial designer Eric Strebel has saved some seriously cool tricks for. Strebel shows you how to extrude it, how to make it both flexible and sandable, and how to use it to mate two unlike parts together.

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Along the way, in addition to revealing practical efficiency tips involving plastic bags, paste wax and blue tape, he covers something that's super-important with materials that change their state and thus workability: The importance of timing. Interfere too late, and you've just created a mountain of work for yourself. Jump in at the right time and you can get great results with minimal effort. Save yourself some future headaches and learn from Strebel's experience: