Epoxy Primer Fun

General Discussion. Make yourself at home...read, ask and answer!

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PostPosted: Tue Jun 07, 2016 8:54 pm
This happened to me twice with ********** and both times it was my fault.
1st time I didn't allow the W&G remove adequate time to flash off. 2nd time I was laying it on too heavy. Spraying white epoxy and trying to get it to cover in one coat.

I now spray epoxy with a 1.4 tip and treat it like a base coat. Haven't had any issues since.
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PostPosted: Tue Jun 07, 2016 9:10 pm
what happened when you put it on to heavy?
Jay D.
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PostPosted: Wed Jun 08, 2016 6:24 am
No chance at using the wrong hardener. Only have 1 big square can of it.

Parts that I sprayed at 15-20 minutes induction time are still tacky after 3 days. Parts I sprayed with the same mix of epoxy an hour later are hard as a rock.

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PostPosted: Wed Jun 08, 2016 9:37 am
badsix wrote:what happened when you put it on to heavy?
Jay D.


Fish eyes.
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PostPosted: Wed Jun 08, 2016 9:43 am
BeoBob wrote:No chance at using the wrong hardener. Only have 1 big square can of it.

Parts that I sprayed at 15-20 minutes induction time are still tacky after 3 days. Parts I sprayed with the same mix of epoxy an hour later are hard as a rock.


Reread your original post. There had to be contamination either in the cup, on the paint screen, stir stick or in the air since the paint was separating on the sides of the cup.

You may need to sand parts that aren't hardening to get the goo off. At least whatever the problem was it seems to be gone now.
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PostPosted: Wed Jun 08, 2016 11:14 am
'68 Coronet R/T wrote:
badsix wrote:what happened when you put it on to heavy?
Jay D.


Fish eyes.

yep, that's been my experience. I call it separation, but for sure it doesn't like being put on heavy.
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PostPosted: Wed Jun 08, 2016 5:01 pm
Put it on light with detail gun, fisheyes. Put it on normal with a full sized gun, fisheyes. Put it on way heavy trying to cover the fisheyes, they just reappeared. Separation is a a good way to put it.



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PostPosted: Wed Jun 08, 2016 7:13 pm
I keep reading your posts but you've got me on this one! but it almost sounds like it had something to do with your induction time, but it shouldn't. some epoxys use to have induction times and some didn't. I've used them with no induction time and not had problems. you don't say and you don't have to, but what brand epoxy is it. you might contact them and explain your problem and see what they have to say. could be old or a bad batch it should have a batch no. on it please let us know what you find out.
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PostPosted: Thu Jun 09, 2016 6:34 am
I bought a gallon of it 2-3 months ago. This is the third time I have used it and the first time I have had a problem. Previous times I mixed it first thing in the morning then went about setting up and prepping. So it had an extended induction time. This was the first attempt with a normal induction time. Something I am slowly learning, patience pays when playing with paint. Say that six times fast.

The good part is not much went to waste as I have other things around the house I am sealing with it.



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PostPosted: Thu Jun 09, 2016 6:28 pm
BeoBob wrote:Long post, so stay with me here….

So my Sunday started out great. Got up early and got setup for the day. Ate a good breakfast and got to work on the bike by 8:00. Mixed up a 24 oz. batch of epoxy. While it induced I wiped all the parts down one last time with Tamco “final wipe”. 15 minute timer went off, stirred the epoxy one more time, loaded the guns, set them up on a piece of paper, and I’m ready to go.

Started spraying the smallest piece, a side cover. FISH EYES start popping up everywhere!!! Scratch my head and say ****, I haven’t had this problem in months.

Take the other side cover and give it a good wipe down with Prepall and sit it in the sun for a few minutes. Hit it with primer and FISHEYES everywhere!!!! ****. Then I notice the primer on the test paper I used to set the guns up had large areas where the epoxy didn’t stick, kind of like Swiss cheese fisheyes. Look at the mixing cup and the primer was doing the same thing on the side of the cup. Brand new cup from a new supplier… contaminated cup screwed the whole batch?

So I empty the guns, broke them down an gave them a thorough cleaning. Wash the remaining 7 parts again with water and a scotch bright, then wipe them down with Prepall. Wash out an old used mixing cup with gun cleaner, and mix up batch #2 of primer… about 20oz. Wait exactly 15 minutes. Load the big gun up an spray a saddlebag lid with confidence. Everything goes on good, but 20 seconds later FISHEYES start forming. ****! What the hell is going on? Spray on more primer trying to bury the fisheyes. Everything starts running and fisheyes come right back though. ****!!! Something is wrong and I don’t know what. Clean the gun again, then it’s time to take a break in the AC. Did some searching on the internet. Didn’t find anything explaining what was happening. Verified induction time for the primer is 10 minutes. Stumped.

Went back out and didn’t really know where to start. Decided to try a few sample cards. Pulled out a few that I had sprayed previously testing out colors. Scrubbed with red scotch bright. No soap, no Prepall, just water. Loaded up the small gun and sprayed the first one. Primer went down fine… waiting, waiting… NO FISHEYES!!! Loaded up the big gun and sprayed a heavy coat on another card. NO FISHEYES!!! Let them sit for a few minutes in the sun and then hit them again. Everything looked fine.

Somewhat trepidaciously I set out the other saddle bag lid and sprayed it. Primer went on nice and smooth… waiting… waiting… NO FISHEYES!!!

Sprayed the rest of the parts with batch #2 without a hitch.

Waited about half an hour then took batch #1 and added 1oz. of slow reducer and sprayed the test panels. No problems. Sprayed the 6 good parts with batch #1 and everything turned out fantastic.

Looking at the 3 parts that I had problems with you can tell the hardener and epoxy hadn’t fully combined yet when the epoxy was sprayed. The fisheyes oozed clear hardener (see second pic).

Tech sheet clearly states 10 minute induction time. Temp was 80-90 degrees. Humidity was high, normal for Florida. Epoxy and hardener were thoroughly mixed initially, let sit with the lid on for 15-20 minutes using a timer, then thoroughly mixed again before pouring into the gun. Soooo…… what’s up with the primer taking longer than 20 minutes to fully induce?



What exactly are you using for Final wipe??? Prep All ??? is this some sort of W/G remover wipe? If so 15 minutes may not be long enough Flash time for it Epoxy does not like W/G remover at all.
If parts are wiped W/G remover I will let them flash off some times 24 hr before epoxying.

Couple more questions
What are you using for Gun Wash? and were was it purchased ???

What kind of Paint mixing cups are you using and where were they purchased ????
Dennis B.
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Line Maintenance A&P Mechanic and MOC Tech specialist.
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