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CATALYST RANGES FOR RESINS

Catalyst Ranges for 301, 301W, 302, 303 & 305 Resins

  • Uses LBI-321 MEKP
  • 5-15cc per Quart of Resin, 20-60cc per Gallon of Resin.
  • This range is between .5%-2%

Catalyst Ranges for 304, 306, 307, 308 & 309 ISO Gelcoats

  • Uses LBI-321 MEKP
  • 10-20cc per Quart of Resin, 40-80cc per Gallon of Gelcoat.
  • This range is between 1%-2%.

Catalyst Ranges for 901, 902, 585, 555 & H197P Resins

  • Uses LBI-391 MEKP(H197P uses LBI-321)
  • 15-30cc  MEKP per quart of resin, 60-120cc MEKP per Gallon of Resin.
  • This range is between 1.5%-3.0%

A Guide for Catalyst Levels

  • The amount of catalyst added to the resin determines how hot the reaction gets.
  • Heat is what causes the resin to cure.
  • In cool weather (55-60F) catalyze resins in the mid to high range:
    • 301, 301W, 302, 303 & 305 resins at 10-15cc per quart, 40-60cc per gallon
    • ISO Gelcoats at 15-20cc per quart, 60-80cc per gallon
    • 901, 902, 585, 555 & H197P 20-30cc per quart, 80-120cc per gallon
  • In hot weather (75-90F) catalyze resins in the low to mid range:
    • 301, 301W, 302, 303 & 305 5-10cc per quart, 20-40cc per gallon
    • ISO Gelcoats 10-15cc per quart, 40-60cc per gallon
    • 901, 902, 585, 555 & H197P 15-20cc per quart, 60-80cc per gallon.
  • Fiberglassing below 50F is not recommended unless you have some method of warming the resins and materials to room temperature(See Fiberglassing in Cold Weather Tech Guide)
  • If your resin is still hardening too quickly in higher temperatures try chilling your resin in a cooler or refrigerator(DO NOT FREEZE YOUR RESIN!)
  • REMEMBER:  THE MORE CATALYST YOU USE AT A GIVEN TEMPERATURE THE FASTER THE CURE!
  • NEVER CATALYZE RESIN BELOW THE MINIMUM RECOMMENDED QUANTITY!
  • BE ORGANIZED AND HAVE ALL YOUR TOOLS AND SUPPLIES READY! ONCE CATALYZED, RESIN WAITS FOR NO ONE!
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