the correct wire rod for drawdown of low viscosity coating, or other tools? - Paint Talk - Professional Painting Contractors Forum
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Old 12-21-2016, 02:49 AM   #1
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Default the correct wire rod for drawdown of low viscosity coating, or other tools?

Hi,
We use coating in our daily production. We prepare the coating our self by mix 10% of pasta/ toner, 45% of acrylic, 45% of solvent and stir them for 3 hours by using electric agitator.
The mixture will result will be a low viscosity coating (flow rate of 25~35s, zahn cup no 2 at 25C).
We need to check color consistency from batch to batch, and prefer a drawdown method.
We have tested the drawdown using 44mils wire rod and 26mils wire rod but the result, the coating is way transparent.
Is this the best inspection method of color consistency for the coating that we use? Should we use the bigger wire rod or other tools needed?
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Old 12-21-2016, 12:45 PM   #2
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Quote:
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Hi,
We use coating in our daily production. We prepare the coating our self by mix 10% of pasta/ toner, 45% of acrylic, 45% of solvent and stir them for 3 hours by using electric agitator.
The mixture will result will be a low viscosity coating (flow rate of 25~35s, zahn cup no 2 at 25C).
We need to check color consistency from batch to batch, and prefer a drawdown method.
We have tested the drawdown using 44mils wire rod and 26mils wire rod but the result, the coating is way transparent.
Is this the best inspection method of color consistency for the coating that we use? Should we use the bigger wire rod or other tools needed?
What is the SBV%? And what WFT is the 44 or 26 mil wire rod actually creating on the sample board?
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Old 12-21-2016, 08:52 PM   #3
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SBV% is ~30% and the WFT around 3.3 mils for 44mils rod.


Last edited by rdanis; 12-21-2016 at 09:00 PM.. Reason: add image
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Old 12-22-2016, 10:40 AM   #4
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That leaves you barely 1 mil DFT! No wonder it's transparent. The product may need to be applied in several coats before being opaque.
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Old 12-22-2016, 07:29 PM   #5
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What is the typical DFT for a good drawdown result? Is the wire rod still a suitable tool for my case?
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Old 12-22-2016, 07:50 PM   #6
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What is the typical DFT for a good drawdown result? Is the wire rod still a suitable tool for my case?
I would refer you to one of the PT suppliers, i.e. PACman.
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Old 12-22-2016, 10:04 PM   #7
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I would refer you to one of the PT suppliers, i.e. PACman.
Sorry to bother you,
can you please be more clearer and specific?
Not fully understand with the abbreviations
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Old 12-22-2016, 10:08 PM   #8
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Sorry to bother you,
can you please be more clearer and specific?
Not fully understand with the abbreviations
I apologize. PACman is a "Paint Talk" member who is a quality paint supplier. He has mentioned draw downs before. I expect him to comment on this thread. But if he doesn't, you can reach out to him by private message. Use the search for PACman.
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Old 12-22-2016, 10:35 PM   #9
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He does not have enough posts to message.

Try tagging @PACman
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