Resin Calculator – Epoxy Resin Amount
Calculate epoxy resin needed for coating and casting projects
Table of Contents
How to Use
- Enter the surface area you need to cover or cast
- Select your resin type (coating or casting)
- Adjust the coverage rate based on your specific product
- Choose your preferred units (metric or imperial)
- Click calculate to see total resin needed and Part A/B breakdown
What is Epoxy Resin?
Epoxy resin is a two-part chemical compound consisting of a resin (Part A) and a hardener (Part B). When mixed together, they undergo a chemical reaction that creates a strong, durable, and glossy finish.
It's commonly used for coating surfaces like countertops, bar tops, and artwork, as well as for casting projects like jewelry, river tables, and decorative pieces.
Coating vs. Casting Resin
Different resin types are designed for specific applications:
- Coating Resin: Thin layers (1-2mm), self-leveling, ideal for surfaces like tables and artwork. Coverage: ~12 m²/L
- Casting Resin: Thick pours (up to several inches), slower cure time, perfect for molds and deep projects. Coverage: ~2 m²/L for thicker applications
- Deep Pour Resin: Specialized for very thick applications, minimal heat generation
- UV Resin: Quick-curing under UV light, ideal for small projects and jewelry
Common Mixing Ratios
Most epoxy resins use specific mixing ratios that must be followed precisely:
- 2:1 ratio (most common): 2 parts resin to 1 part hardener by volume
- 1:1 ratio: Equal parts resin and hardener
- 4:1 ratio: 4 parts resin to 1 part hardener
- Always follow manufacturer specifications for your specific product
- Incorrect ratios can result in tacky, uncured, or weakened finishes
Application Tips
For successful resin projects, follow these best practices:
- Work in a well-ventilated area with proper protective equipment
- Ensure surface is clean, dry, and properly prepared
- Measure resin and hardener accurately using weight or volume
- Mix thoroughly for at least 3-5 minutes, scraping sides and bottom
- Remove air bubbles using a heat gun or torch after pouring
- Maintain ideal temperature (70-75°F / 21-24°C) during application and cure
- Allow proper cure time before handling or using the surface
Factors Affecting Coverage
Several factors can affect how much resin you'll actually need:
- Surface porosity: Porous materials absorb more resin
- Desired thickness: Thicker coats require more material
- Temperature: Affects viscosity and self-leveling properties
- Multiple coats: Each layer requires additional resin
- Wastage: Account for 10-15% extra for mixing containers and spillage
Frequently Asked Questions
- How do I know how much resin I need?
- Measure your surface area and select the appropriate resin type. Coating resin typically covers 12 m²/L at 1-2mm thickness, while casting resin covers less due to thicker applications. Always order 10-15% extra.
- What's the difference between Part A and Part B?
- Part A is the resin component, and Part B is the hardener. They must be mixed in the correct ratio to cure properly. Most common ratio is 2:1 (resin:hardener), but always check your product specifications.
- Can I use coating resin for thick pours?
- No. Coating resin generates too much heat in thick pours and can crack or yellow. Use casting or deep pour resin for applications thicker than 6mm (1/4 inch).
- How much extra resin should I order?
- Order 10-15% more than calculated to account for mixing container wastage, spillage, and potential coverage variations. It's better to have extra than to run short mid-project.
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