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I had a similar problem when building my cedar kayak with mixing the epoxy resin. All the kitchen measuring containers that I started out using I found were totally inaccurate. In the end I went to the fiberglass shop and they had calibrated mixing cups. I spent an afternoon testing each cup for accuracy using small digital scales and water. The best part is they're cheap and throw away. For smaller mix ups I've used a syringe or a measuring cup that comes with a medicine bottle.
 

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I use the same type as Bondo, although mine don't have such detailed markings, they're marked every 2oz. They're easy to clean, finish doesn't stick to them much. Plus, if you waste one, you're only out about $1. I have a couple sizes, depending on how much finish I need to mix.
 

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For stuff that really needs to be accurate, calibrated cups or just weigh it on a scale. For MS and poly though, I don't bother and just eyeball it. It doesn't matter much if it's not exactly 50/50. I'll pour in the poly, mark the cup to know where it filled up to, then add MS until it 'looks' about twice as much :)

Cheers,
Brad
 

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WalpoleWoodworks,

I am not sure you are seeking or need this level of precision or accuracy, but a chemist measures volume with precision and accuracy using a Graduated Cylinder. These tend to be metric, but if working with ratios, it does not require any conversion from milliliters to pints.

To give you an idea, here is a link to a site that sells Graduated Cylinders (there are others)

http://www.hometrainingtools.com/chemistry/glassware-plasticware/graduated-cylinders
 

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Discussion Starter · #8 ·
JBrown,
Thanks for the link, the cylinders look just right. I spray poly once a month or so, and have had trouble with degradation of the mix as it sits in a can. So many small batches. The accuracy requirement is minimal, I'm just looking for consistent mix to minimize fiddling with the spray gun.
 
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