National Oak
USC® 77702 SMC/Fiberglass Filler – 8 oz Pouch, Waterproof, Gray-Green
USC® 77702 SMC/Fiberglass Filler – 8 oz Pouch, Waterproof, Gray-Green
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Description
The USC® SMC/Fiberglass Filler (8 oz pouch) is a premium, waterproof filler engineered for sheet molding compound (SMC) and fiberglass repair. Formulated for strength, ease of application, and excellent adhesion, this filler is ideal for repairing cracks, dents, tears, and holes in SMC substrates such as trucks, motorhomes, jet skis, and other composites.
Its creamy consistency makes it exceptionally easy to mix, spread, and sand compared to conventional fiberglass fillers. With superior adhesion to SMC, fiberglass, steel, and aluminum, this filler is designed for both structural repairs and finishing work.
For reliable performance, it cures quickly, sands to a smooth featheredge, and provides a perfect base for glaze and paint topcoats.
Features
- 100% waterproof – prevents moisture-related failures
- Structural strength – rated for SMC repair
- Excellent adhesion to SMC, fiberglass, steel, aluminum, wood, and more
- Smooth, easy sanding compared to traditional fiberglass fillers
- Fast curing – sands in 15–20 minutes at 77°F
- Featheredges cleanly for professional refinishing results
Suggested Uses
- Repairing cracks, dents, and holes in SMC panels (trucks, RVs, jet skis, boats)
- Structural repairs on fiberglass substrates
- Use on steel, aluminum, wood, and masonry with proper prep
Technical Specifications TDS - Click Here
| Property | Detail |
|---|---|
| Part No. | 77702 |
| Container Size | 8 oz pouch |
| Color | Gray-Green |
| Mixing Ratio | 1½" ribbon of hardener per golf ball size of filler (≈2% by weight) |
| VOC (Packaged) | 242 g/L |
| VOC (Applied) | 2.0 g/L |
| Density | 0.84 lbs/gal (avg) |
| Viscosity @ 77°F | 160,000 cps (avg) |
| Maximum Thickness | 1/4" (sanded) |
| Gel Time @ 77°F | 3–5 min |
| Sanding Time @ 77°F | 15–20 min |
| Shore “D” Hardness (24 hr) | 75–80 |
| Substrates | SMC, Fiberglass, Steel, Aluminum, Wood, Masonry, Concrete |
| Container Type | Flexible Pouch |
| Form | Liquid |
Important Notes
- Do not apply over fresh or uncured coatings.
- Do not return mixed filler to pouch—remaining contents will harden.
- For best results, topcoat with USC® Final Finish Glaze before priming and painting
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