Short answer: about 60 fl oz (0.47 gal) of mixed epoxy for one ⅛" flood coat on a 24×36 in coffee table, tray or desk top, or about 69 fl oz (0.54 gal) with 15% for edges and drips. Add a thin seal coat first on bare wood.
Math: 24 × 36 × 0.125 in = 108 in³ ÷ 1.805 in³ per fl oz = 60 fl oz. Change the numbers for your piece.
| Size | ⅛" coat | +15% |
|---|---|---|
| 12×12 in | 10 fl oz | 11 fl oz (0.09 gal) |
| 12×24 in | 20 fl oz | 23 fl oz (0.18 gal) |
| 24×24 in | 40 fl oz | 46 fl oz (0.36 gal) |
| 24×48 in | 80 fl oz | 92 fl oz (0.72 gal) |
| 36×72 in | 180 fl oz | 206 fl oz (1.61 gal) |
| 4×8 ft | 319 fl oz | 367 fl oz (2.87 gal) |
| Coat | Mixed epoxy |
|---|---|
| Seal coat (~1/32") | 17 fl oz (0.13 gal) incl. 15% |
| Flood coat ⅛" | 69 fl oz (0.54 gal) incl. 15% |
| Two flood coats (¼" total) | 138 fl oz (1.08 gal) incl. 15% |
Most tabletop epoxies self-level around ⅛" per coat; check your label's maximum. Then check the kit size and cost per ounce.
About 60 fl oz per ⅛" coat, or 69 fl oz (0.54 gal) with 15% for drips and edges.
On bare or porous wood, yes: a thin seal coat reduces bubbles from air escaping the wood. Plan about a quarter of the flood-coat amount.
Most tabletop epoxies are designed for about ⅛" per coat. For thicker builds, pour multiple coats or use a deep-pour epoxy rated for the depth.
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