I've mixed the silica in before the hardener without issue, but I noted the measurement before thickening. Then I added the amount of hardener based on that level not the level after thickening.
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1999 Wellcraft 22WA-200 Ocean Runner
1982 Grady White Tarpon 190-110 Evinrude-Sold
1996 Striper 2100WA-RIP Sandy
1989 Wellcraft 18-Sport-125 Force-sold
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