Thixotropic Additive
Anti-Sag and thickening additive for epoxy resins & Stonelith. Take control of the resin flow. Stop runs and sagging on vertical coats, whether you are working with Nerpa Coating Epoxy or Stonelith.
What it is & how it works
This solvent-free, fine mineral powder thickens your mix at rest (so it stays put), but becomes easier to brush/roll while you are working. Once you stop moving it, it “rebounds” quickly to resist drips, sags, and settling.
Why makers choose it
- Anti-sag control for vertical and edge coats
- DIY gelcoat preparation with epoxies
- Dense, fast-mixing powder (typically less dusty and easier to handle than fluffy thickeners like fumed silica)
- Solvent-free (no heat or solvents needed to activate)
- Helps you keep a smooth, workable finish while improving hold
Recommended usage levels:
| Product | % additive by weight |
| Stonelith | 2-5 |
| Coating Epoxy High Viscosity | 3-15 |
| Coating Epoxy Medium Viscosity | 3-15 |
| Casting Epoxy | 5-20 |
| Casting Epoxy Lite | 5-20 |
Specs at a glance:
Form: off‑white, fine powder
Chemistry: organophilic phyllosilicates (clay‑based thixotrope)
Behaviour: strong shear‑thinning (pseudoplastic), fast recovery
Compatibility: solvent‑free and solvent‑borne resins (epoxy, vinyl ester, unsaturated polyester, adhesives/sealants. Always check the compatibility of the medium/resin before use.