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Old 04-25-2015, 05:57 PM   #1
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Default Micro checking riddle

Ok this one is a doozy.

Prepped surface very efficiently , primed with zinser 123 acrylic , Top coated with tremclad black acrylic. Finish is perfect.

Same cans 2 weeks later, different project. Now the tremclad is micro checking where ever it is over the zinser 123.

Coincidentally the tremclad was applied over BIN zinser too and it micro checked also.

Wherever the tremclad has been applied where there is no primer it is not micro checking. WTF.

One variable is that it was colder outside then the previous application. That doesnt answer why the tremclad not on the primer doesnt micro check.

It just feels like a cruel practical joke. This is a sign job so Ill have to sand this area and prime it again and use something else. Still nothing is adding up...
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Old 04-25-2015, 06:36 PM   #2
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Was there a difference in recoat time over the Zinsser 123 at the first job compared to the second job?

I suspect the harder top coat film was compromised by trapped solvents in the Z-123.
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Old 04-25-2015, 06:57 PM   #3
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Im on site re Sandig, one thing I failed to mention was the temp difference between both times. This time, the failure time, the machines which I'm painting are very cold. Last time it was hot.

Actually on some spots where the sun is hiting it, it seems to be OK.
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Old 04-25-2015, 07:06 PM   #4
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Did you have any fans going? I believe cold temps retard the solvent evaporation since many solvents are heavier then air. Even though Z-123 is waterborne, I'm certain, as a fast dry primer, it encorporates some fast evaporative water soluable solvents. Without the temps in an ideal range, and the absense of forced air, those solvents will only evaporate enough to form an un-unstable primer film, or a finish film for that matter.
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Old 04-25-2015, 07:09 PM   #5
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The failure time it had ample amount of dry time.

Even if it is the temp, how come where there's no primer is fine. FML
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Old 04-25-2015, 07:32 PM   #6
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Quote:
Originally Posted by jason123 View Post
The failure time it had ample amount of dry time.

Even if it is the temp, how come where there's no primer is fine. FML
I'm guessing that the fact the finish coat didn't deform where there wasn't any primer, leads me to believe with even more confidence, that the primer is the weak link here. As I mentioned, you may have had a faux film of primer form with un-evaporated solvents underneath of it. Once you ask a finish coat to form a film over something that's that unstable, either wrinkling will occur with more flexible finish coatings, or cracking will occur on harder ones.
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Old 04-25-2015, 10:26 PM   #7
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Whatever ? I sanded the top coat, didn't remove it all,it seemed to adhere well, its fully scuffed Ill top coat it tomorrow with some other paint.

Then finally start the sign painting.
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Old 04-26-2015, 01:07 AM   #8
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Yeah the primer must not have cured enough. Not familiar with tremoclad, I've had breakthrough check and wrinkle over BM 046 primer before.
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Old 04-26-2015, 06:26 AM   #9
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What is microchecking?
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Old 04-26-2015, 08:50 AM   #10
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I think he means that effect that's similar to painting latex on silicone.
I also think it's a primer issue & something in it not liking the tremclad.
The temperature effect on the primer or the combination?

Tremclad water based is basically a water based DTM.
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Old 04-27-2015, 10:07 AM   #11
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Keep in mind, although I am sure to ruffle some feathers, that 123 is not the best primer out there. Adequate yes. Best no. In most applications it is the best bang for your buck, but not under a high performance borderline industrial dtm like Tremclad. Why wouldn't you use the Tremclad w/r primer?
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