Worbla vs EVA: picking the armor material

Materials guide 🔥 · Workshop crew · Nov 2026

The short answer

Both make armor that survives a con floor. Pick by shape and budget: big flat plates and pauldrons are EVA country, cheap, fast, cut with a knife. Fiddly curves, filigree trim and pieces with lots of surface detail are Worbla country, it welds to itself with heat alone. Most full builds use both. The app's bench-gear list carries the kit for whichever you pick.

When EVA wins

• Cost: a standard 6 mm floor-mat sheet costs a fraction of thermoplastics per panel.
• Big, smooth volume: cuirasses, greaves, shin guards, heat-form over a shape, bevel the seams (the first armor build guide covers the whole move).
• Speed: cut with a utility knife (or a scroll saw for curves), glue with contact cement, and it's a costume part by lunch.
• Weight: 5–6 mm foam stays light even at scale-shoulder size.

The catch: raw EVA is foam, not armor. Paint bites straight in unless you seal it. Plasti Dip or a glue-based gesso pass comes first. Seams show unless beveled; the bevel-and-burnish is the craft.

When Worbla wins

• Complex curves: heat at 90–110 °C and the sheet drapes like clay, armor filigree, visor trims, shaped tiara edges, whole crowns formed over a wig head.
• Self-welding: pieces join with heat alone (a hair dryer is the minimum tool; a heat gun is the real tool). No glue lines to sand.
• Scraps recycle: trimmings roll into new sheets, nothing is wasted across a build.
• Detail holds: emboss it, press textures in, shape it over craft foam for a crisp sandwich.

The catch: cost per sheet is real, the honeycomb backside prints texture into every surface (unless you buy the smooth variants), and the heat-burn risk on fingers is higher, gloves and ventilation, same as foam.

The sandwich: both at once

The pro trick is Worbla + foam: a foam core glued up, wrapped hot in the thermoplastic so the shape locks and the surface becomes paintable-shell smooth. The foam keeps it light and cheap; the skin carries the detail. Use it for shoulder plates, bracers and crowns that need both structure and crinkle.

A pauldron weekend, worked both ways

One shoulder dome, blank 24 cm across, started Saturday morning. The EVA route: two 5 mm sheets, cut and beveled as one compound curve, contact cement at the seam, heat-formed over a bowl — the dome is shell-ready by Saturday night and sealed Sunday morning before color (the seal-first rule above). The Worbla route: a foam core shaped first, one thermoplastic sheet warmed to 90–110 °C and draped over it — the dome closes Sunday morning because the shell forms and skins in one pass, and it primes straight away with no seal coat. Two real trade-offs at one bench: EVA wins the materials bill, Worbla wins the clock on fiddly curves. Either way the dome is a single piece on the planner's board, and its materials ride the app's rows marked Need → Ordered → Owned → Used — mid-weekend the board shows what's still on order, the app's state ladder for every line.

First-timer mistakes, both materials

Finishing either one