hey coodeville! the proper ratio for centari using hardener is 8 parts color, 2 parts reducer,1 part hardener. this is correct when using 793s hardener[which gives a great gloss /depth]the proper reducer to use will vary according to temperature [air] that the paint will be applied. right now im using 8022s which is good for 80 degrees and up for spot/partial repair and 75 degrees for overall paint jobs,although i have used the 8022s for overall at and above 80 degrees.as it warms up you have to use different reducers,your dupont paint shop will tell which reducer to use.hope this helps,see ya! jimm