How much epoxy for a 30 oz tumbler?
You need about 33 milliliters (1.1 fluid ounces) of mixed epoxy per coat for a 30 oz tumbler averaging about 3.4 in wide with 7¼ in of coated height, including what stays in the cup. Two coats is about 65 ml.
How to work it out
- π × 3.4 in × 7.25 in = 77.4 sq in per tumbler
- × 0.02 in = 25.4 ml on the tumbler; × (1 + 5%) + 5.91 ml left in the cup = 1.1 fl oz per coat (one batch) × 2 = 2.2 fl oz
- (473 ml kit ÷ 2 coats − 5.91 ml cup loss) ÷ 26.6 ml per tumbler per coat = 8 tumblers mixed together
- Per coat: 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 0.55 fl oz (0.66 oz) + Part B 0.55 fl oz (0.55 oz)
A 30 oz tumbler holds half as much again as a 20 oz skinny, but its coated surface is only slightly larger — the extra capacity comes from width, not height. Most 30 oz blanks taper, so measure the diameter near the top and bottom of the coated area and use the average.
Adjust for your project
More options: waste · cup loss · ratio …
- Per coat when mixing — Part A (resin)
- 0.55 fl oz (16.3 ml)
- Per coat when mixing — Part B (hardener)
- 0.55 fl oz (16.3 ml)
- All coats
- 2.2 fl oz (65.1 ml)
- Tumblers per kit (all coats, mixed together)
- 8 tumblers
- Coated area (per tumbler)
- 77.4 sq in
- How it batches: you mix one batch per coat for the tumbler in the batch, and about 0.2 fl oz stays in the cup each time — so coating several at once wastes less per tumbler. Tumblers per kit assumes every tumbler the kit covers is coated from one batch per coat (8); coating them one at a time, the kit does 7.
- KS Resin’s rule of thumb is 1–1.5 ml of epoxy per ounce of tumbler capacity — 20–30 ml for a 20 oz. Real use depends on viscosity, room temperature and how long you spread, so weigh what’s left in your cup after the first tumbler and adjust the thickness to match.
Epoxy for a 30 oz tumbler, by number of coats
| Coats | All coats | Tumblers per kit (all coats, mixed together) |
|---|---|---|
| 1 coat | 1.1 fl oz | 17 tumblers |
| 2 coats | 2.2 fl oz | 8 tumblers |
| 3 coats | 3.3 fl oz | 5 tumblers |
| 4 coats | 4.4 fl oz | 4 tumblers |
What to know about coating a 30 oz tumbler
Capacity rules overestimate this cup. KS Resin’s rule of thumb of 1–1.5 ml per ounce of capacity suggests 30–45 ml a coat for a 30 oz, but the coated side here is about 77 sq in against roughly 75 for a 20 oz skinny, so the calculator lands at about 33 ml, cup loss included. Mix 35 ml or so for the first one, weigh what is left in the cup, and adjust from there.
Average the taper correctly. Measure across the coated area just below the tape line and again just above the bottom band, add the two, and halve it — a cup that is, say, 3.9 in at the top and 2.9 in near the base averages 3.4 in. Using the widest diameter alone overstates the surface by about 15% on a cup like that. Measure the coated height along the side between the tapes, not the overall height of the blank.
Tapered cups are harder to keep even. Epoxy on a sloped wall tends to creep while the turner spins, so spread it thin, keep the turner running until the coat has started to thicken, and check the wide end for sags. A heavier 1/32 in coat, sometimes used to bury chunky glitter, jumps to about 48 ml a coat.
A 16 fl oz kit does seven of these at two coats when you coat them one at a time, or eight coated together from one batch per coat — the same as the skinny version in how much epoxy for a 20 oz skinny tumbler, so one price per tumbler covers both sizes when you work out costs.
Different size? Use the full Tumbler Epoxy Calculator.
What you’ll need
- Tumbler epoxy (1:1 thin-coat)Mid-range price
Made to be spread thin on a cup turner, with a working time long enough to even out the coat.
See options on Amazon (opens in a new tab) - Cup turner for tumblersMid-range price
Slowly rotates a coated tumbler so the epoxy cures evenly instead of sagging to one side.
See options on Amazon (opens in a new tab) - Digital scale (0.1 g)Budget price
For mixing by weight. Far more accurate than cup lines for small batches — and it doubles for the water method on molds.
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Frequently asked questions
How much epoxy for three coats on a 30 oz tumbler?
About 98 milliliters in total (3.3 fl oz), which is 4 tumblers per 16 fl oz kit coated one at a time, or 5 tumblers coated together.
How much epoxy for a heavy glitter coat on a 30 oz tumbler?
About 48 milliliters per coat at 1/32 in, cup loss and allowance included — 95 ml for two coats.
How many 30 oz tumblers does a 32 oz epoxy kit do?
About 14 tumblers coated one at a time at two typical coats each, or 17 tumblers if you coat them together from one batch per coat — including what stays in the cup.
Other common sizes
- How much epoxy for a 20 oz skinny tumbler — 1.07 fl oz
Sources
- KS Resin — How much epoxy resin do I need for a tumbler? (opens in a new tab) — Manufacturer rule of thumb: 1–1.5 ml of epoxy per ounce of tumbler capacity (20–30 ml for a 20 oz, 30–45 ml for a 30 oz)
- ArtResin — FAQ (opens in a new tab) — Work at about 75–85°F (24–30°C); cured resin tolerates heat only up to about 120°F
- Epoxyworks — The Basics of WEST SYSTEM Epoxy Resin and Hardener (opens in a new tab) — Temperature drives working time and cure; pot life vs working time