Project notes
Understand this estimate
Fiberglass resin quantity depends on fabric area, layer count and a documented resin factor for that fabric and process. There is no universal wet-out rate.
How to use the calculator
Measure one fabric layer
Enter the laminate area once, measured for a single layer.
Inputs Fabric area per layer
Use a documented resin factor
Use a factor supplied for the selected fabric and application method; do not treat the example as a product rate.
Inputs Documented resin factor
Count layers and optional margin
Enter a whole number of identical layers. Add an allowance only when your project planning supports it.
Inputs Layers · Extra allowance
Formula and variables
Mixed resin gallons = fabric area × documented resin factor × layer count × (1 + allowance ÷ 100).
- AFabric area per layer
- Area covered by one layer.ft²
- RDocumented resin factor
- Entered material rate per square foot.US gal/ft²
- NLayer count
- Whole number of identical layers.layers
What the result means
Result interpretation
The output is mixed resin volume for the entered factor and layer count. It does not account for resin retained by tools, substrate absorption or process losses beyond your explicit allowance.
Limits and assumptions
The estimate depends on fabric weight, application technique, absorption and waste. The entered factor has not been verified for your product.
Worked example
Two layers over a small panel
Assumptions
- The supplied fabric-specific factor is 0.08 US gal/ft².
- Both layers use the same area and rate; no allowance is added.
Calculation
- 10 × 0.08 × 2 = 1.6 US gal.
| Mixed resin | 1.6 US gal |
|---|
Common questions
- What resin factor should I enter?
- Use a value documented for your fabric weight, resin system and application method. This calculator does not provide a universal default.
- Does the allowance account for poor wet-out?
- No. It is a separate quantity margin and cannot validate laminate quality or technique.