GFRC Methods (Glass Fiber Reinforced Concrete) Our customers often have questions about which method to use. • Spray up or self-consolidating facecoat: Use on 3D pieces or on flat surfaces with surface exposure (acid etch, sandblast). • Direct cast no facecoat: Use when there will not be surface exposure (light sanding, form liner). All powder High Performance Admixtures and Supplies: www.trinic.us Trinic, LLC – info@trinic.us – 800-475-1975 #precast #trinic #uhpc #gfrc | Trinic LLC.