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West System 407 Low-Density filler is a blended microballoon-based filler used to make fairing putties that are easy to sand or carve. Reasonably strong on a strength-to-weight basis. Cures to a dark red/brown color.
Reviews for WEST System 407 Low Density Filler
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used for filling weave in 6oz glass sheathing
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on a kit car
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Does exactly what they say it will
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I used this to achieve final contours on the front edge fairing of an airplane canopy. It worked VERY well ... mixes well, easy to smooth into minor surface irregularities, and sands more readily than microballoons.
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Use in places you want to fair. I used this on fiberglass boats above and below the waterline. This wets out well and adheres well. It is a bit harder than 410 but spreads out to really fine edge. You can mix any of the West System fillers to get just the right mix you need any job.
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Use it on my boat. Great color and holding power for wooden boats
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