Work out exactly how much epoxy to mix before you pour, so you don't run short mid-pour or waste $40 of resin.
Volume = length × width × depth (rectangles) or π × r² × depth (rounds). One cubic inch is 16.39 ml and one US fl oz is 29.57 ml. Most epoxies weigh about 1.1 g/cm³, which matters if your kit specifies a ratio by weight, not volume — check the label: a 2:1 by volume resin is often roughly 100:45 by weight.
| Project | Size | Resin (with 10%) |
|---|---|---|
| 4" coaster | ¼" deep | ~2 fl oz |
| River table | 48×6×1" | ~1.7 gal |
| Charcuterie board coat | 18×10×⅛" | ~14 fl oz |
Resin clings to cups, stir sticks and the mold walls, and wood soaks some up (seal coat first). 10% is fine for molds; 15–20% for live-edge wood.
Tabletop/coating epoxy is usually limited to ⅛–¼" per layer; it gets hot and can crack or yellow if poured thicker. Deep-pour resins allow 1–2"+ per pour but cure over 24–72 hours. Always follow your manufacturer's maximum pour depth.