How Much Epoxy for a Table Top or Bar Top? Seal Coats & Flood Coats Explained
A gallon of mixed epoxy covers about 12 ft² at the standard 1/8 inch flood coat — but the seal coat, the edges, and the drips all want their share too.
At the standard 1/8 in flood coat, one US gallon of mixed epoxy covers about 12–13 ft² (a 3 mm pour covers roughly 3 m² per 10 L). Add a thin seal coat first on raw wood — around 80 ft² per gallon — and a 10% waste allowance for the epoxy that runs over the edges. A bar top is a couple of gallons; a side table is a few dozen fluid ounces.
The two layers of a table top pour
Seal Coat
- Thin layer, brushed or squeegeed on — not poured
- Closes the pores in wood so trapped air can’t bubble up into your finish
- Roughly 80 ft² per gallon (2 m²/L); skip it only on non-porous surfaces
Flood Coat
- The thick self-leveling pour that creates the glass surface
- Standard thickness is 1/8 in (3 mm) — pure geometry: area × depth
- Maximum around 1/4 in (6 mm) per pour — deeper builds are poured in stages
How to read the inputs
Dimensions & Shape
- Measure the actual top — rectangle or round
- Split an L-shaped counter into rectangles and add the results
Flood Coat Thickness
- 1/8 in is the standard single pour; 1/16 in for a refresh or repair coat
- Volume scales directly with thickness — double the depth, double the epoxy
Waste Allowance
- Flood coats run over open edges by design — that epoxy comes off your total
- 10% minimum; more for narrow pieces where edge dominates surface
Mix Ratio
- Most table top epoxies are 1:1 by volume; some run 2:1
- Measure both parts accurately — off-ratio batches stay soft
Worked example
An 8 ft × 3 ft bar top (96 × 36 in = 24 ft²): the 1/8 in flood coat needs 96 × 36 × 0.125 = 432 in³ = 1.87 gallons. One seal coat at 80 ft²/gal adds 0.30 gal. With 10% waste on top, the job takes 2.39 gallons of mixed product — so a 1.5-gallon kit won’t do it; order two.
Size your own top
Rectangle or round, inches or centimeters — the calculator sizes both coats and splits the total into Part A and Part B.
Full result gives seal coat, flood coat, waste, and the A:B mix split.
Open the live calculator →Common mistakes
- Skipping the seal coat on raw wood — the number one cause of a bubble-filled flood coat
- Pouring a flood coat thicker than the product’s maximum — the cure overheats, and you get cracks or a soft finish
- Buying the exact computed volume with no allowance for edge run-off and what stays in the mixing bucket
- Using table top epoxy for a river pour — castings deeper than 1/4 in need a dedicated deep pour product
- Eyeballing the 1:1 mix on a small batch — small volumes magnify ratio errors, so measure, don’t guess
Frequently Asked Questions
How much epoxy does an average table take?
A 4-seat dining table around 4 ft × 3 ft (12 ft²) needs roughly 1 gallon of flood coat at 1/8 inch, plus about a fifth of a gallon for the seal coat and waste — call it 1.2 gallons all-in. An 8 ft bar top runs about 2.5 gallons. Small pieces like a side table need only 30–40 fluid ounces.
Can I skip the seal coat?
On raw wood, no. The seal coat closes the pores so air trapped in the timber can't rise into the flood coat as bubbles. On non-porous surfaces — laminate, sealed concrete, an earlier epoxy coat — you can usually go straight to the flood coat.
Why do I need extra for edges and waste?
A flood coat self-levels, which means it flows over open edges until surface tension stops it. Coating the edges is usually the point — but it also means real usage runs above the flat-surface math. A 10% allowance is the working minimum; narrow pieces with lots of edge relative to surface need more.
What if I want a thick, deep pour like a river table?
Table top epoxy is limited to about 1/4 inch per pour — thicker pours overheat as they cure. River pours and thick castings use a dedicated deep pour epoxy with a slower cure. Size the casting with the Deep Pour Epoxy Calculator, then come back here for the final flood coat that finishes the surface.