Hi Matt
The pumps aren't that accurate and I wouldn't trust them to this expensive type work.
When I had the pumps I simply used them to dispense the resin into a mixing cup on the scales watching the scales and ignoring the number of pumps. It sure was neat and easy to mix really small batches accurately. Because they eventually screw up and they cost too much to keep replacing them I decided not to use them.
A little trick I learned while dribbeling the resin all over the place trying to pore out of a gallon can was this. Pore some resin into a clean cup and then pore this into your mixing cup very accurately. No mess, do the same with the hardener from another clean cup. Pore the resin you don't use back into its container. ( Make sure you don't get mixed up when you pore the unused materials back into its original container or your going to have problems.) To bad they didn't make a squeeze top you could screw on like a mustard container???
Hope this helps.
Fred     

thanks for the information Fred, 

Unless I have been doing it wrong...here is how I get my totals. Everything has cured in the proper time so I think I am doing it correct.    First figure out how much total resin you need then divide that number by the mix ratio... Example....if you need 550 grams total and you have a 100:30 mix ratio divided 550/1.3=423.07 grams of resin.  So then fill a cup to 423g of resin then fill with hardener to 550g. 

If you happen to go over the amount of resin you were sopose to like say you end up with 432g of resin just multiply that by the mix ratio for the new total. example....432x1.3=561.6 total.

Also if you need to figure how big of a cup you will need to mix in just multiply the total resin by .035274 This will give you how many ounces that amout of resin is.  example.....550grams = 19.4oz  

hope this helps,

 Dennis

Dennis, your maths seems correct to me!

However, I tend to keep things "simple stupid" and use quantities based on 100parts resin or simple divisions of, to make the hardener calculation much easier in your head when in the workshop. 

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant