just bought 20kgs of resin and 1ltr of catalyst. the only problem is that i dont know the proper mixture for these two. so if anyone has a good formula please tell. im looking to work 5 minutes in between small portions. so in other words 5 minutes to start hardening would be ok. ill get pix but dont know how to post of the metrials (brands). id have some pix taken say by tomorrow if it would help???