Deep-pour planner

Epoxy gives off heat as it cures. In a thin coat that heat escapes. In a thick, heavy pour it builds on itself until the resin cracks, yellows, smokes, and in documented cases catches fire. Every product has a maximum depth per pour. This planner splits your total depth into equal layers under that limit, tells you how much to mix for each layer, and turns your recoat interval into a schedule. It won't produce a plan for a pour deeper than the product's limit.

Notes

The defaults are 6 mm (¼ in) per layer for tabletop epoxy and 50 mm (2 in) for deep-pour epoxy. Tabletop products are usually rated for 3–6 mm per coat. Deep-pour products range from about 25 mm to more than 100 mm depending on the chemistry. Ratings assume roughly 21–24 °C. A warmer room, warmer resin, or a bigger batch all shrink your safe depth. If your data sheet rates deeper than the default, you can raise the max, and the planner will flag that you did.
Recoat windows vary by product and temperature, and there's no one right number. Tabletop systems are often recoated within a few hours to about a day, while the surface is still chemically receptive. After that window closes, scuff-sand the surface before the next coat. Deep-pour systems commonly wait 24–72 h, or until the last layer has cooled to room temperature. The 6 h and 24 h prefills are only there so the schedule has something to show.
The 1 L warning is a conservative rule of thumb, not a physical constant. Heat scales with mass, so a wide layer within the depth limit can still run hot. Depth is the hard limit. Volume is the warning sign.