This is an industrial grade paint / epoxy additive that can change the properties of what it is added to. For oil paints, adding fumed silica changes the rheology of the paint and can even add a bit of luminescence. For recipes there are a variety of online sites. Fumed silica is a component in many professional oil painting gels, for instance.
This is a bag of industry standard fumed silica. Given the amount included it is a good value. Simply look online for how much this tends to cost.
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