Easy Epoxy Calc

How much resin for a 24 × 36 canvas?

Short answer

A 24 × 36 in canvas (6 square feet) needs about 65.8 fluid ounces of mixed resin for a full 1/8 inch coat, including 10% extra — just over half a gallon, or 32.9 fluid ounces of each part for a 1:1 resin, mixed as 2 batches.

How to work it out

  1. Area: 36 in × 24 in = 864 sq in
  2. 864 sq in × 1/8 in = 108 cu in = 59.8 fl oz; + 10% = 65.8 fl oz (≈ 72.1 oz on a scale)
  3. 65.8 fl oz ÷ 48 fl oz per batch = 2 batches of about 32.9 fl oz
  4. Mix ratio 1 : 1 by volume, SG A 1.15 / B 0.95 (typical, not published by the maker — type your data sheet’s SGs for exact weights) → Part A 32.9 fl oz (39.5 oz) + Part B 32.9 fl oz (32.6 oz)

At 6 sq ft, a 24 × 36 is big enough that a stretched canvas will sag in the middle under the weight of the resin — roughly 4–5 lb of it. Prop the centre from underneath with a support cut to fit inside the stretcher bars, or use a cradled wood panel.

Adjust for your project

in
in
Most resin boxes’ coverage claims assume a thin coat — pick 1/16 in to match the box. 1/8 in is a full, glassy, self-levelled coat and uses about twice as much.
fl oz
Total of both bottles together, e.g. a 32 oz kit = 16 oz + 16 oz.
More options: waste · ratio · SG A …
%
Cup residue and drips
Only changes the Part A / Part B split — it’s printed on the kit. Tabletop and art resins are usually 1:1; deep pour often 2:1.
From the TDS, in g/ml. Leave blank for 1.15 (typical, not published by the maker).
From the TDS, in g/ml. Leave blank for 0.95 on 1:1 kits or 0.97 on other ratios (typical, not published by the maker).
fl oz
Your own limit per cup or bucket. Go smaller if your resin has a short working time.
Art resin to buy65.8 fl oz1,947 ml
Whole batch by weight, incl. waste (kitchen scale)
72.1 oz (2,044 g)
Kits to buy
3 kits
Mixing batches
2 batches
When mixing — Part A (resin)
32.9 fl oz (973 ml)
When mixing — Part B (hardener)
32.9 fl oz (973 ml)
Part A by weight
39.5 oz (1,119 g)
Part B by weight
32.6 oz (925 g)
Left over from the last kit
30.2 fl oz (892 ml)
  • What to buy: 3 × 32 fl oz art resin kits. Each kit has both bottles (resin + hardener) — you don’t buy them separately. Looking at a different kit size? Change Kit size above.
  • Mix it in 2 batches of about 32.9 fl oz — pour the first, then mix the next while you spread — so no cup sits long enough to heat up and start to thicken.
  • fl oz = measured in a cup; oz = weighed on a scale. Use whichever your resin label gives.

For this job · affiliate link
Clear art resin kitYou need 65.8 fl oz; 3 × 32 fl oz kits leaves 30.2 fl oz over, so topping up with a smaller kit may be cheaper — compare kit sizes. A 1:1 art resin self-levels over a painting without needing a scale.
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Top only vs. top and 1 1/2 in sides (24 × 36 at 1/8 in)

Top only vs. top and 1 1/2 in sides (24 × 36 at 1/8 in)
What you coatArt resin to buyWhole batch by weight, incl. waste (kitchen scale)Kits to buy
Top only (edges taped)65.8 fl oz72.1 oz3 kits
Top + 1 1/2 in sides79.5 fl oz87.1 oz3 kits

What to know about a 24 × 36 canvas

A 24 × 36 is the standard large poster size and a common size for statement paintings, and it is where the weight starts to matter. The mixed resin weighs about 72.1 oz (4.5 lb); after cup residue and drips, roughly 4 lb of it cures on the piece. Rigid foam board or thin plywood cut to fit inside the stretcher bars and shimmed so it touches the back of the canvas stops the belly forming. Check the hanging hardware too — the finished piece is noticeably heavier than the bare canvas.

The kit maths is awkward: two 32 fl oz kits hold 64 fl oz, about 2 fl oz short. Three quarts cover it with about 30 fl oz left; a 1 gallon kit leaves about 62 fl oz, enough for a second coat or another piece. Coating the 1 1/2 in sides takes the total to about 79.5 fl oz (table above), which still fits in three quarts.

With the default 48 fl oz batch limit that is two batches of about 33 fl oz. Mix the first, pour it over one half in a zigzag, and start mixing the second straight away while a helper spreads. Don’t mix the whole half gallon in one bucket to save time: as Epoxyworks explains, a large mass of mixed epoxy heats itself and thickens faster, which is the opposite of what you want on a big surface.

Smaller: how much resin for an 18x24 canvas, or how much resin for a 50x70 cm canvas if you buy metric canvases. Bigger: how much resin for a 30x40 canvas and how much resin for a 36x48 canvas.

Different size? Use the full Resin Art Calculator.

What you’ll need

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Frequently asked questions

How much resin for a 24x36 canvas at 1/16 inch?

About 32.9 fluid ounces with 10% extra — just over one 32 fl oz kit, so 2 kits of that size, in a single batch.

How much is left over coating a 24x36 canvas from a 1 gallon kit?

The full 1/8 inch coat uses about 65.8 fluid ounces, which leaves about 62.2 fluid ounces in a 128 fl oz kit — enough for a second coat.

Other common sizes

Sources