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post #7 of Old 12-18-2010
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I use cab-o-sil (fumed colloidal silica) anywhere that I don't want epoxy to run. You can mix it much thicker than other fillers without a loss of strength. It does not weaken the resin so it is extremely difficult to sand and fair but it is very easy to control so there is less fairing involved than with other fillers.

You can also mix in easily faired fillers to get both benefits.
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