A pour 24 by 12 inches and 1/8 inch deep takes about 20 fl oz of mixed epoxy, 10 of resin and 10 of hardener at 1:1.
Shape
Mix ratio, A to B by volume (on the kit)
Depth in decimals: 1/8″ is 0.125, 1/4″ is 0.25, 1/2″ is 0.5.
How much epoxy to mix?
Part A (resin): 9.97 fl oz, 295 mL. Part B (hardener): 9.97 fl oz, 295 mL. That’s 1:1 by volume, 590 mL in all.
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Mix by the ratio on the kit
WEST SYSTEM’s 105 resin mixes 5 to 1 with its 205 and 206 hardeners and 3 to 1 with 207 and 209. TotalBoat Fathom mixes 2 to 1, and ArtResin and TotalBoat ThickSet 1 to 1. Each figure is by volume. WEST SYSTEM says not to change the ratio to adjust the cure time, and TotalBoat says not to adjust Fathom’s ratio.
| Epoxy | By volume (A:B) | By weight (A:B) |
|---|---|---|
| ArtResin | 1:1 | 100:84 |
| TotalBoat ThickSet | 1:1 | 1.11:1 |
| TotalBoat Fathom | 2:1 | 100:44 |
| WEST SYSTEM 105 with 205 or 206 | 5:1 | 5:1 |
| WEST SYSTEM 105 with 207 or 209 | 3:1 | Not given |
ArtResin says the weight ratio differs from the volume ratio because resin and hardener have different densities.
How deep one pour can be
- ArtResin: self-levels to about 1/8 inch; for more depth, pour more thin layers.
- WEST SYSTEM: no layers thicker than 1/2 inch, and thinner if enclosed by foam or other insulation.
- TotalBoat ThickSet: coats of 1/2 inch at most, at least 4 hours apart; small castings up to 2 inches deep with 10 fl oz of mixed epoxy or less.
- TotalBoat Fathom: up to 2 inches a layer in river tables and slabs, up to 3 inches in a mold of up to 1 mixed gallon; not for pours under 1 inch.
TotalBoat says to mix only as much ThickSet as you’ll use in the next 20 minutes, and no more than a gallon of it at a time. Fathom’s sheet gives at least 48 hours before demolding deep or large pours, and 72 hours for smaller ones.
Mixed epoxy heats up as it cures. WEST SYSTEM says several inches of it in a mixing cup can get hot enough to melt the cup, burn your skin or ignite combustible materials, and TotalBoat says a mass of Fathom can reach 200 to 300°F or hotter when poured thicker than its instructions allow. When to pour depends on the epoxy. ArtResin says to pour right after mixing and not to let a large volume sit in the cup, while TotalBoat says to let mixed Fathom sit in the pail for 20 to 30 minutes so bubbles rise. Follow your kit’s sheet, and keep to its layer depth.
How two-part epoxy sets and cures
Two-part epoxy