3M Glass Bubbles

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3M Glass Bubbles are premium hollow glass microspheres for a lightweight fairing compound that sands clean and resists moisture. The step up from commodity Q-cells. 3M glass bubble s are the lightest, easiest-sanding filler we stock: hollow spheres that turn epoxy or polyester into a low-density fairing compound that knocks back with light sanding. Best above the waterline, not for structural bonds. See how they compare in microballoon vs Cabosil fillers. Show more