Messed up. Mixed my epoxy Primer and catylist 50/50 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-12-2008, 09:10 PM
 
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Messed up. Mixed my epoxy Primer and catalyst 50/50

I was trying to figure out why the primer wasnt drying. Then realized I mixed it 1:1 instead of 2:1. Will it just take longer to dry, or am I going to have trouble?

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Last edited by chadroc; 10-13-2008 at 09:42 AM.
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Old 10-12-2008, 09:32 PM
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It most likely is going to be ok...
let it sit a couple days
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Old 10-13-2008, 09:43 AM
 
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Thanks! I sure hope so!
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Old 10-13-2008, 07:13 PM
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I am not an epoxy primer expert, but what I do know about epoxy is that it requires a ratio of materials to correctly set, unlike polyester resin which will just set slower if not catalyzed sufficiently.

I suggest contacting the paint manufacturer and see what course to proceed on.
Good Luck.
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Old 10-13-2008, 07:42 PM
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What brand is it?
Most epoxies I've used mix 1:1.
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Old 10-13-2008, 10:18 PM
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Been there done that more than once just let it cure for 24 hrs then scuff with a 3M red scuff pad and re prime with more epoxy mixed 2-1 and you should be ok good luck
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Old 10-13-2008, 11:18 PM
 
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its omni.
Thanks ragtop! I was hoping someone else has!
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Old 10-14-2008, 10:28 AM
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Quote:
Originally Posted by chadroc
its omni.
Thanks ragtop! I was hoping someone else has!

MP 170?

I have seen this happen before (ok it was me ) and NO it will not be ok! If I understand this correctly epoxy mix ratios are critical since proper curing depends on having the right mix and too little or too much will prevent it from setting properly, applying another coat of properly mixed epoxy will only result in a solid coat over a poorly cured coat. Since the paint durability depends on having a solid foundation all the way to the metal you are running the risk of losing everything you put into this job if you try to apply the final coats over this improperly cured base. Epoxy is completely different than Polyester which can be mixed with varying amounts of activator to control the cure rate and adding too much activator to epoxy can cause serious problems.
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Old 10-15-2008, 09:17 AM
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Quote:
Originally Posted by oldred
MP 170?

I have seen this happen before (ok it was me ) and NO it will not be ok! If I understand this correctly epoxy mix ratios are critical since proper curing depends on having the right mix and too little or too much will prevent it from setting properly, applying another coat of properly mixed epoxy will only result in a solid coat over a poorly cured coat. Since the paint durability depends on having a solid foundation all the way to the metal you are running the risk of losing everything you put into this job if you try to apply the final coats over this improperly cured base. Epoxy is completely different than Polyester which can be mixed with varying amounts of activator to control the cure rate and adding too much activator to epoxy can cause serious problems.
Scary, we are in agreement,LOL!
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Old 10-16-2008, 09:17 AM
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Before you do anything else, I would put that part out in the sun to dry and cure, at least see if it will. I understand the unequal ratio mixed, you will know in a few hours what you have on your hands.
I have had parts shot at 65 take more than 24 hours to dry in a garage, but the sun cures it in a couple. Worth a try. Then you can try anything else, with no harm.
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Old 10-16-2008, 09:50 AM
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I mixed some 2K incorrectly(SPI) so I called the manufacturer (Barry K) and asked his opinion. I was ok in that instance. Calling the mfr's customer service is the only safe way and probably the best way to go about doing this. Their answer will most likely be conservative though. Unless we have the manufacturer's name and product information and have had real life experience with that product, any of our answers are a 'shot in the dark' and your project's final finish might suffer.

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Old 10-16-2008, 09:59 AM
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I just recently used some ppg dp 40 on my project. The mixing instructions were very confusing. The label on the can said to mix it 2:1 but the instruction sheet that they gave me said 1:1. I mixed 2 batches, one each way and it didn't seem to matter. I asked them about the conflicting info. and they didn't have an answer for me. They said they would ask the factory rep and get back to me but that was over a week ago and I haven't heard a thing.
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Old 10-16-2008, 02:01 PM
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Fellows he is talking about EPOXY here not 2K Urethane primers which are a COMPLETELY DIFFERENT animal!!! Epoxy MUST be mixed properly and when I did this same thing a couple of years ago I called my supplier who in turn spoke with the factory rep who said DO NOT use it if mixed improperly! It was explained to me that the "hardener is not a simple "activator" and is in fact a critical component of the mix which must be in the proper ratio, too much is as bad as not enough.
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