Accurate finish mixing

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Forum topic by WalpoleWoodworks posted 06-06-2016 06:18 AM 683 views 0 times favorited 7 replies Add to Favorites Watch
View WalpoleWoodworks's profile


10 posts in 1015 days

06-06-2016 06:18 AM

Topic tags/keywords: measure liquid clean

I’m looking for a product to help measure accurate proportions of finish to thinner. This product should be quick to use and clean. I generally mix 1/2 a pint at a time, 50/50 of OMS and Poly. Right now I use a turkey baster and a calibrated eye.

Thanks in advance.

-- Adam, NewHampshire

7 replies so far

View SpottedGum's profile


13 posts in 982 days

#1 posted 06-06-2016 09:11 AM

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.

View bondogaposis's profile


5091 posts in 2553 days

#2 posted 06-06-2016 12:57 PM

Use automotive paint mix cups, like this. They are available in other sizes as well.

-- Bondo Gaposis

View BinghamtonEd's profile


2298 posts in 2571 days

#3 posted 06-06-2016 02:53 PM

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.

-- - The mightiest oak in the forest is just a little nut that held its ground.

View WalpoleWoodworks's profile


10 posts in 1015 days

#4 posted 06-07-2016 12:25 AM

Thanks guys, I’ll head for the auto parts store soon.

-- Adam, NewHampshire

View MrUnix's profile


7050 posts in 2401 days

#5 posted 06-07-2016 12:41 AM

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 :)


-- Brad in FL - In Dog I trust... everything else is questionable

View JBrow's profile


1366 posts in 1122 days

#6 posted 06-07-2016 03:35 AM


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)

View WalpoleWoodworks's profile


10 posts in 1015 days

#7 posted 06-12-2016 10:54 AM

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.

-- Adam, NewHampshire

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