PRO-SET LAM Laminating Hardeners

Description

PRO-SET® Laminating Hardeners – Fast, Medium, Slow, Extra Slow & Extended Open Time

PRO-SET® Laminating Hardeners are engineered for high-quality hand layup, vacuum bag, and infusion-assisted laminations where predictable room-temperature cure and excellent mechanical properties are essential. Pair any speed with our PRO-SET Laminating Resin (Z-21012) to tune open time and cure to your shop temperature and project size.

Choose Your Working Time

Fast LAM-224 – Short open time for smaller parts, quick turnarounds, and cool shops.
Medium LAM-226 – Balanced working time and cure for most day-to-day laminations.
Slow LAM-229 – Longer open time to wet out larger layups and complex schedules.
Extra Slow LAM-237 – Maximum working time at room temp; ideal for multi-ply layups.
Extended Open Time LAM-239 – Longest open time window for very large parts or warm ambient conditions.

Available Package Sizes

.33 Gal, 1.4 Gal, 4.7 Gal, 4.9 Gal, 5 Gal (select size and speed from the options above).

Why PRO-SET Laminating Systems

Consistent room-temperature cure with reliable post-cure capability.
Excellent fiber wet-out and low blush for clean, cosmetic parts.
High strength and toughness for marine, automotive, aerospace, and sporting goods.
Speed options let you match pot life/open time to shop temperature and part size.

Mixing & Use

Mix only with PRO-SET Laminating Resin (Z-21012). Follow the mix ratio and processing instructions on the hardener label and in the Technical Data Sheet for the selected speed. Always measure accurately, mix thoroughly, and observe proper safety and ventilation practices.

Applications

Hand layup and vacuum-assisted laminations for hulls, decks, body panels, interior structures, race parts, tooling skins, and more.

Note: Cure speed, pot life, and sandability depend on hardener speed, ambient temperature, and batch size. Refer to the product TDS for detailed times and properties.

Pairs with: PRO-SET Laminating Resin (Z-21012)

Specifications

Laminating Hardener Comparison (Verified)

Speed	Typical Working/Open Time*	Initial Gel / “Green”	Best For	Notes
Fast (LAM-224)	~40 min	~1.5–2 hr	Small parts, cool shops, quick turn	Minimize batch size to control exotherm.
Medium (LAM-226)	~2–3 hr	~4–5 hr	General laminating, day-to-day work	Balanced pot life and cure speed.
Slow (LAM-229)	~4–5 hr	~6–7 hr	Large layups, complex schedules	Longer wet-out window at room temp.
Extra Slow (LAM-237)	~7–8 hr	~12–14 hr	Very large parts, warmer shops	Maximum room-temp working time.
Extended Open Time (LAM-239)	~8–9 hr†	~12–14 hr†	Very large/multi-ply laminations	Longest open time window in the line.

*Times are approximate; actual values vary with temperature, batch size, and layup. †Published at ~29 °C / 85 F; at ~25 °C / 77 °F expect slightly longer.

Use only with PRO-SET Laminating Resin (Z-21012).