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[Video] Large Scale Mold Making - Making the Negative "Tool"

Step 2Positioning and Drawing a Waterline

Positioning and Drawing a Waterline
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Now that you have a good fit in your well sanded stand - adjust your plug until you have an excellent waterline. If there were an order of critical steps - this is the second most critical. You can use towels and bits of foam etc. as shims.

Once you have a satisfactory waterline, mark it with a pencil. This way, the second half will be perfectly aligned too.

I know you won't like this... But... Remove the plug and apply a paste wax to one the side to be molded. It is VERY important that you do this outside of the stand - we want bondo to bond to the stand, but no the mold. So at this time, do not wax the stand. Please, don't cut corners here - it will be worth it in the end.

Replace the plug in the stand, shimming to achieve the correct waterline.
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Author:trebuchet03
I'm an Engineer in San Francisco. Mass producer. Former Intern. Rapid Prototyper. Sometimes, I post Instructables. My Favorite number: 42 By profession - I am an energy engineer. I count electrons p...
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