General Finishes Exterior 450 Topcoat, Clear, Flat, Quart
General Finishes Exterior 450 Topcoat, Clear, Flat, Quart is intended for exterior use.
Features
- Clear-drying acrylic/urethane finish
- Tintable
- UV absorbers protect finish film
- Mildewcide slows mold and mildew growth
- Flexible film moves with wood
Best for
Vertical exterior wood including fences, patio furniture, garage doors and entrance doors; Raw wood, stained wood and non-white painted surfaces
Specs
| Color or finish | Clear |
|---|---|
| Sheen | Flat |
| Selected size | Quart |
| Base | water |
| Use | exterior |
| Coverage | 140-160 sq ft/quart; 560-640 sq ft/gallon |
| Touch dry | 30+ minutes |
| Recoat | 2+ hours |
| Full cure | 21 days at 70°F and 50% humidity |
| Application conditions | Recommended 70°F and 50% humidity, out of direct sunlight |
| Coats | 2-3 coats on current page; TDS says at least 3 total coats |
| Apply with | Brush; Roll; Spray |
| Thinning | Water, GF Extender or GF Accelerator per TDS |
| Cleanup | Soap and water for hands; GF Brush & Gun Cleaner for equipment |
| VOC | <125 g/L |
| Topcoat compatibility | Self-sealing; can be used as optional topcoat over darker GF Milk Paint colors. Do not use over light or white paint. |
| Manufacturer part # | QXF |
How to apply
Start with the manufacturer's preparation steps: Raw wood: sand through 150 or 220 grit, remove dust and dry; Sealed surface: scuff clean with 50:50 denatured alcohol and water, dry and sand lightly; Test compatibility and adhesion.
- Clean, sand and dry surface as specified
- Stir product and test adhesion
- Apply 2-3 coats by brush, roll or spray
- Allow at least 2 hours between coats
- Allow 21 days for full cure
Good to know
Use limits: Decks; Light or white paint (may yellow); Linseed or Danish oil finishes.
: Flat 2024 SDS: not classified as hazardous; no label elements. Product page separately warns of irritation and harm if swallowed.
: Product page carries California Prop 65 warning for toluene and reproductive harm.
Keep the recoat time and full cure time separate when planning the project. The recoat figure tells you when another coat can be applied; it does not replace the full cure guidance.
Questions
How much will I need?
Use these manufacturer coverage figures: 140-160 sq ft/quart; 560-640 sq ft/gallon. Match the figure to the container size, and account for the stated number of coats.
When can I apply another coat?
The listed manufacturer recoat guidance is 2+ hours. Follow the application conditions and instructions for this product.