Catalyst is supplied with most resin packs. All resins must have catalyst to start the hardening process, added at 1% – 3% by weight. Ideal addition is 2% or (20ml per kg of resin). Catalyst is a corrosive material and must be handled with special care. Never allow catalyst to come into contact with accelerator as this can cause a fire or explosion. Dispensers are strongly recommended for safe and accurate use.