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What grade of Isoproyl Alcohol ?
Wingtsun
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British Columbia, Canada
Joined: July 16, 2006
KitMaker: 295 posts
Historicus Forma: 0 posts
Posted: Sunday, December 02, 2018 - 12:03 PM UTC
What strength of isopropyl acohol should I use for thinning acrylic paint? 99 percent or 70 percent ?
brekinapez
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Georgia, United States
Joined: July 26, 2013
KitMaker: 2,272 posts
Historicus Forma: 14 posts
Posted: Sunday, December 02, 2018 - 12:42 PM UTC
91% is the strongest I've seen and it is what I buy.
Pave-Hawk
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Western Australia, Australia
Joined: May 05, 2006
KitMaker: 900 posts
Historicus Forma: 40 posts
Posted: Sunday, December 02, 2018 - 12:53 PM UTC
I use 99% as that's what I can get cheaply at an electronics store.
Dragon164
#226
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British Columbia, Canada
Joined: February 20, 2012
KitMaker: 1,909 posts
Historicus Forma: 0 posts
Posted: Sunday, December 02, 2018 - 02:24 PM UTC
90 to 99%

Cheers Rob.
MLD
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Vermont, United States
Joined: July 21, 2002
KitMaker: 3,569 posts
Historicus Forma: 66 posts
Posted: Sunday, December 02, 2018 - 02:50 PM UTC

Quoted Text

What strength of isopropyl acohol should I use for thinning acrylic paint? 99 percent or 70 percent ?



I have been running 70% drug store stuff through airbrushes with Tamiya, Poly Scale (back in the old old days), Model Master Acryl, and Gunze for 25+yrs and had no troubles.
SSGToms
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Connecticut, United States
Joined: April 02, 2005
KitMaker: 3,608 posts
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Posted: Monday, December 03, 2018 - 02:45 PM UTC
I use 91% from Wal-Mart or the drug store.
Wingtsun
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British Columbia, Canada
Joined: July 16, 2006
KitMaker: 295 posts
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Posted: Wednesday, December 05, 2018 - 02:21 PM UTC
Thanks everyone
kevinekstrom
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Illinois, United States
Joined: December 08, 2017
KitMaker: 82 posts
Historicus Forma: 0 posts
Posted: Monday, February 10, 2020 - 02:09 PM UTC
I have nothing but problems with pebbling effect when using anything over 90%. The alcohol evaporates much too quickly unless you cut it with something causing the paint to pebble. I strongly suggest the weakest percentage you can find. That's just my 2 cents, other may have good luck with the 90 stuff, but I never have.
Scarred
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Washington, United States
Joined: March 11, 2016
KitMaker: 1,791 posts
Historicus Forma: 2 posts
Posted: Monday, February 10, 2020 - 03:13 PM UTC
When in doubt use the thinner made by the paint manufacturers. Save the alcohol for cleanup.
Lakota
#123
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New Mexico, United States
Joined: November 17, 2008
KitMaker: 1,202 posts
Historicus Forma: 14 posts
Posted: Tuesday, February 11, 2020 - 12:47 AM UTC

Quoted Text

When in doubt use the thinner made by the paint manufacturers. Save the alcohol for cleanup.


I agree, for years I used one brand of acrylic thinner or alcohol from the grocery/drug store. I switched and started matching the brand of thinner to the brand of paint and never had a problem after that. Alcohol for clean up is great.
Take care,
Don "Lakota"
Kevlar06
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Washington, United States
Joined: March 15, 2009
KitMaker: 3,670 posts
Historicus Forma: 25 posts
Posted: Tuesday, February 11, 2020 - 06:33 AM UTC

Quoted Text

When in doubt use the thinner made by the paint manufacturers. Save the alcohol for cleanup.



This is good advice. Next time you get a chance, read the ingredients on Tamiya “yellow cap” thinner on the side of the bottle. There’s no drug store alcohol anywhere in there. I seldom have problems when I mix paint with proprietary thinners, it’s when I deviate that problems inevitably arise. For cleaning my AB, I buy a gallon of lacquer thinner from my local HD or Lowe’s for about $10 and it lasts me a long, long time.
VR, Russ