Fumed Colloidal Silica (also known as CAB-0-SIL)
Use when an extremely hard solid with high density is needed, i.e. structural bonding, filling and filleting. Add strength to a top coat by using a small amount of Colloidal Silica ( about a tablespoon per 4 ounces). This will add strength and finish absolutely clear. The white color in the mixing cup will disappear when it cures.
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