Black Medium-Thick CA Glue — Superglue Pro Kit

Starbond Black Medium-Thick CA is the starbond black CA glue engineered for woodworkers and makers who need more than a color match — they need structural performance. At 500 cPs with a rubber-toughened formula, this black super glue fills deep cracks, stabilizes knot voids, and cures impact-resistant in walnut, wenge, ebony, rosewood, and any dark hardwood where standard adhesives either run, crack, or leave a visible light-colored fill.

The 500 cPs viscosity is the key difference from thinner black glue formulas: it bridges wide cracks without soaking in, builds up in knot voids without sinking, and sits on vertical grain checks without running before the cure sets. The rubber-toughened polymer adds a second advantage — the cured fill absorbs impact and vibration rather than fracturing, making it the right adhesive wood filler for any dark-wood repair that will take real use.

Pair with Starbond Aerosol Accelerator as a complete black CA glue and activator system for instant freeze at every stage of a layered fill.

Wood Knot Filler Black CA Glue for Stabilization & Deep Void Repair

Knot voids are the most demanding application for any wood knot filler: they’re deep, irregular, porous, and often on dark hardwood species where color match is non-negotiable. Standard CA is too thin and sinks before curing. Standard epoxy works but requires mixing, measuring, and hours of cure time. Starbond Black Medium-Thick CA is the black super glue alternative that gives you instant results with no mixing and complete color control.

At 500 cPs, this black cyanoacrylate glue is thick enough to build up in the void without immediately absorbing into the surrounding porous wood. Each layer can be frozen instantly with Starbond Aerosol Accelerator building a solid, sandable fill in minutes rather than hours.

Knot fill workflow:

1. Clean the void, remove loose fibers and debris with compressed air or a pick.
2. Apply black CA glue into the void with a microtip, starting at the deepest point.
3. Spray Starbond Aerosol Accelerator to freeze the layer instantly.
4. Repeat until the fill is slightly proud of the surface.
5. Sand flush from 120 grit through 400 grit. Finish with oil, wax, or lacquer.

The jet-black cure color of this starbond black CA glue integrates into the dark wood grain visually, no white fill line, no color mismatch under finish.