Enter your board's length and how you plan to glass it, and the PureGlass Resin and Fiberglass Calculator tells you exactly how much resin and fiberglass to order, what hot coat and gloss add to that total, and which fin boxes and leash plugs to add to the cart. No chart to squint at, no rounding up "to be safe" and ending up with three unused quarts on a shelf. We built it at our shop in Costa Mesa because the question we hear most from shapers isn't which resin is best, it's simpler than that: how much do I actually need for this board, start to finish. Open the calculator and follow along below for exactly what it covers.
In this article
- What the calculator asks you for
- How it turns that into a material list
- What you get back
- Light, standard, or heavy: what changes
- Step by step: using the calculator
- Why run the numbers instead of eyeballing it
- Quick summary
- FAQ
What the Calculator Actually Asks You For
Six things, none of them complicated:
- Board length, from under 5'6" up to 9'0"-10'0"
- Glassing schedule: light, standard, or heavy
- Resin type: epoxy (2000 Clear, CE Ultra, or Kwik Kick) or polyester
- Hardener speed for epoxy, slow or fast, based on shop temperature
- Catalyst percentage for polyester, also temperature-driven
- Extra steps: hot coat, gloss coat, fin box system (Futures or FCS II), leash plug
That's it. No stringer material, no deck thickness, none of the variables that sound relevant but barely move the resin math. We kept it to the inputs that actually change how much you need to order.
How It Turns That Into a Material List
Board length and glassing schedule set the base: a longer board needs more surface area covered, and a heavier schedule means more layers of cloth over that same surface. Resin type and hardener or catalyst choice adjust the mix ratio, since epoxy and polyester don't wet out cloth the same way. Every extra step you check, hot coat, gloss, a fin box system, a leash plug, adds its own line to the total instead of getting folded into a vague "add some more" estimate.
What You Get Back: Resin, Fiberglass, and the Accessories You'd Forget
The result is a total resin volume in ounces and a fiberglass amount in yards of 27" cloth, with a 15% buffer built in for waste and spillage since nobody wets out a board with zero runoff. If you checked a fin box or leash plug, that gets added to the list too, so you're not two coats into a glass job before realizing you never ordered the Futures boxes.
Light, Standard, or Heavy: What Changes
| Schedule | What it means | Typically used for |
|---|---|---|
| Light | Single layer, minimum resin | Performance shortboards built to be as light as possible |
| Standard | One layer bottom, two on the deck | Most everyday shortboards and mid-lengths |
| Heavy | Extra cloth on the deck and rails | Longboards, heavier riders, boards built to take a beating |
Step by Step: Using the Calculator
- Enter your board length. Round to the nearest size bracket if it falls between two.
- Pick a glassing schedule. Light, standard, or heavy, based on the table above.
- Choose your resin and speed. Epoxy or polyester, then the hardener speed or catalyst percentage that matches your shop temperature.
- Check any extra steps. Hot coat, gloss, fin box system, leash plug, whatever applies to this build.
- Review the totals and add to cart. The calculator lists resin, fiberglass, and any accessories together so you can order the whole job in one pass.
- Resin Research 2000 (Clear) Kit w/ Hardener, $49.95
- 4oz Fiberglass "E" Cloth, $5.00 per yard
- Futures Fin Box, $8.50
Why Run the Numbers Instead of Eyeballing It
Order too little and you're stopping mid-lamination to mix another batch while the clock is already running on the cure. Order too much and you've paid for resin that sits on a shelf until it's past its useful shelf life. Neither one is really about the money, though the money adds up faster than most builders track. It's about not finding out mid-build that the estimate was off. That's the whole reason the tool exists: not to replace what a shaper already knows about their own build, but to take the guesswork out of the order before it costs a wasted batch or a trip back to the shop.
Enter board length, glassing schedule, resin type, and any extra steps like hot coat, gloss, fin boxes, or leash plugs. The calculator returns total resin in ounces and fiberglass in yards, with a 15% buffer, plus any accessories you checked, all ready to add to cart in one pass.
Frequently Asked Questions
How much resin do I need to glass a surfboard?
It depends on the board's length and how heavy a schedule you're running, which is exactly why we built the calculator instead of publishing one flat number. A longer board on a heavy schedule can use more than double what a short, lightly glassed board needs.
What's the difference between epoxy and polyester when the calculator asks me to choose?
Epoxy is lighter, bonds better to EPS foam, and gives you a longer working window, but it costs more. Polyester is cheaper and more common on traditional PU blanks, with stronger fumes and a shorter cure window. See the full comparison if you're still deciding.
Does the calculator account for hot coat and gloss coat separately?
Yes. Hot coat and gloss are both optional checkboxes, and each one adds its own resin amount to the total rather than folding it into the base lamination number.
Do I need to add fin boxes and leash plugs myself, or does the calculator handle that?
Check the box for Futures or FCS II and add a leash plug if the build needs one, and the calculator adds those items to your order alongside the resin and cloth.
Why does the calculator add a buffer to the resin and glass totals?
Because nobody wets out a board with zero spillage or trim waste. The 15% buffer covers that reality so you're not stopping a lamination coat short because the estimate assumed a perfect pour.
Order Once, Get It Right
The calculator exists so a shaper can enter a board's specs once and walk away with a complete, accurate order, resin, fiberglass, and hardware included, instead of a rough guess based on the last board that happened to be a similar length. Run your board's numbers before your next build.
Ready to Order for Your Next Build?
Enter your board's specs and get a complete material list, ready to add to cart.