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Tnemec-zinc

7K views 18 replies 4 participants last post by  slinger58 
#1 ·
Does anyone have experience in painting this two coat primer?....theme color-zinc series 90-97


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#6 · (Edited)
I'm trying to coat it with an tnemec series 1074. I'm curing it out at 250degrees for 20 minutes but only waiting about 30 minutes before I top coat.


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Why are you heating it at that temp for curing? The TDS allows for up to 140 degrees surface temps max during application. The recommended curing accelerator is 44-710. There's no reference to heating it to 250 degrees for curing. The TDS only states that it will tolerate up to 250 degree temps once cured by normal chemical reaction.
 
#9 · (Edited)
If I put the oven at 140 I doubt the paint will get hot enough to cure


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You may be compromising the coating with those temps. It only allows for a 140 degree surface temp for application. This is a chemical cure coating, not an oven cured coating like powder coatings. That's why they recommend an accelerator. But none of these details probably answer your question about the finish you're getting. BTW, are you agitating the zinc urethane?
 
#13 ·
If anything, mist the surfaces down with water. But the zinc needs ample dry times before topcoating, or later on in the field, your topcoat is going to blister and you will redoing your job.


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