FOR BEST RESULTS MIX EXACTLY 50-50 and make sure curing temperatures are absolutly no lower than 70 degrees minimum for at least 36 hours. The glue will set up in about 12 hours but will need to fully cure at least 24-36 hours for maximum strength. Mixed properly you can achieve the strongest bond possible! An improper or Eyeballed mix can result in failure. Use our measuring syringes for exact and easy measurements, sure to give you the best results. Never miss mix a batch of glue again. With these you cant go wrong, use them over and over again. Use one for resin and one for the hardner. Sold by the pair.