A standard 4 in (100 mm) × 8 mm coaster takes about 63 ml; a set of four is ~275 ml with waste. A 20 oz skinny tumbler (3 in × 8 in) needs roughly 1.5 fl oz of epoxy per coat on a cup turner.
Four 100 mm × 8 mm round coasters need about 250 ml of mixed resin, around 275 ml (9.3 fl oz) with 10% waste.
Around 1–2 fl oz of mixed tumbler epoxy per coat; most makers do 2 coats.
Tumbler-specific (thicker, faster) epoxy is easier because it clings without running. Thin art resin needs more spinning time and more coats.
Related: resin calculator · pour layer planner · mix ratio by weight · cure time by temperature · project cost
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