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  #11  
Old 09-02-2019, 08:16 AM
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wirejock wirejock is offline
 
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Default Surface prep

You didn't mention how the surface was prepped. It has an effect on how well the paint adheres. Try rubbing a big piece of Gorilla tape on the part then rip it off.
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  #12  
Old 09-02-2019, 10:10 AM
David Paule David Paule is offline
 
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Default

I used EkoPoxy recently for the first time. I prepped the surface using the Stewarts cleaner and etch products, and mixed according to directions. But first, I found that the EkoPoxy itself was a very thick, almost chunky material. Stewart's support said that this is normal for this product, and to use a drill mixer. After mixing the can up with that, it was a thick syrup.

I poured off the desired amount, measuring by weight, and added the hardener and water, in that order, in the specified quantities. The resulting viscosity was fine for the spray gun and tip I was using. I used a Devilbiss FLG 4 gun with a 1.5 mm tip. The gun was what they'd recommended. Later I learned that they also recommend one of the more expensive Tekna guns as well. The Tekna has been recommended before here on VAF for other products.

It sprayed fine, I thought, but the finish was very rough and somewhat uneven. After the requisite time period, per the instructions, I shot a second coat. Same initial roughness but more even. I let it dry and after several hours, the finish became smooth, zero roughness, and even.

Bottom line, all in all, I like the product.

I intend to top coat it with clear gloss EkoCrylic when the temperatures fall into the window again.

Dave
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  #13  
Old 09-03-2019, 05:54 AM
Reflex Reflex is offline
 
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Default

Quote:
Originally Posted by sprucemoose View Post
I'll admit that I never tried it, but in general it is best to stick with Stewart's recommendations.
It should be noted that Stewart's makes no recommendation about the order in which the components are mixed; only that the ratio is 5:1:1. Adding one component at a time enables the user to more thoroughly mix the components. In addition, adding the water first thins the base and enables the catalyst to be mixed more easily.

Ultimately, I'm sure the order in which the components are added doesn't matter or Stewart's would mention it.
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  #14  
Old 09-03-2019, 06:11 AM
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Quote:
Originally Posted by Reflex View Post
It should be noted that Stewart's makes no recommendation about the order in which the components are mixed; only that the ratio is 5:1:1. Adding one component at a time enables the user to more thoroughly mix the components. In addition, adding the water first thins the base and enables the catalyst to be mixed more easily.

Ultimately, I'm sure the order in which the components are added doesn't matter or Stewart's would mention it.
This is incorrect, they specifically state in both the written instructions and in their videos to mix the paint and catalyst prior to thinning.

From the Ecopoly/ Ecocrylic instructions. Emphasis added.

Mixing by Weight:
The paint is mixed 4:1:1 by weight. For example, if you use 100 grams of Part A paint, the amount of catalyst needed is 25 grams (25% of Part A amount). Mix the Part A and catalyst thoroughly. Let sit for 5 minutes. Add 1 part distilled water and mix thoroughly. (same amount of water as catalyst). Let sit for 5 minutes, then it is ready to spray. If desired for your particular spray technique, equipment or environment it is permissible to adjust water amount slightly, but be cautious, a little water goes a long way.
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  #15  
Old 09-03-2019, 08:37 AM
Reflex Reflex is offline
 
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Jeff,

Your in put is appreciated. However, EcoPoxy and EcoPoly are different products. The original post was regarding EcoPoxy. I've posted the instructions below. The order of mix is not addressed and "slaking" is not required with EcoPoxy. Perhaps the methodology for EcoPoly is different. I've never used EcoPoly so I am unfamiliar with the requirements for its use. The instructions for EcoPoxy can also be found at:

https://stewartsystems.aero/wp-conte...structions.pdf

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  #16  
Old 09-03-2019, 03:49 PM
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sprucemoose sprucemoose is offline
 
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You are correct that this discussion is about Ecopoxy and the directions you posted are clear. I wonder if that is an oversight on their part or intentional, since I believe all of their 2-part products use the same catalyst (at least the Ecopoly and Acrylic do) and presumably the same procedures. Have you ever reached out to them to clarify?

I used all of these products (plus the single part primer and Ecofill) while painting my last airplane. In my mind I somehow took the Ecopoly/ acrylic instructions and applied them to Ecopoxy. Sorry for the confusion.
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  #17  
Old 09-04-2019, 04:29 AM
Reflex Reflex is offline
 
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Jeff,

I spoke to Stewart's at Oshkosh last year regarding the constancy out of the can and my solution of putting a couple of quarts into a gallon bucket. But I didn't ask about the order of mixing.

I was told that if I worked long enough, that the paint would come to the proper consistency and that I could use a mixer on the end of a drill to help. When I stated that the mixer simply balled up the paint like a batch of cookie dough, they said that I could carefully add just a little bit of water.

What surprised me was that when I mentioned mixing the quarts into a gallon can, it was frowned upon. The fear is that I wouldn't get all the contents out of the quart can.

I really like the finished product, but the thickness makes it a challenge to mix without waste. After many "quarts" and many projects over the years, I have never been able get it to spray properly without thinning.
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  #18  
Old 09-23-2019, 06:11 AM
GPV GPV is offline
 
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Default Over Alodine

Thanks for the responses. No one answered my original question but I have tried the product since and decided a mixing mate lid wouldn't mix it well enough. Onto another question...

Has anyone tried Ekopoxy over alodine? I spoke to Stewart Systems and they said it would work, but suggested I rough it up with a scotchbrite pad first. I've never alodined but from what I have read it seems scotchbrite would probably wear through it. Any thoughts?

Btw, my experience with ekopoxy was pretty good. I got a pretty rough sandpapery finish but it was quite tough and smooth enough for plane internals. Will experiment a bit more with the gun settings next time.
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  #19  
Old 09-23-2019, 08:26 AM
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wirejock wirejock is offline
 
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Default Alodine

Quote:
Originally Posted by GPV View Post
Thanks for the responses. No one answered my original question but I have tried the product since and decided a mixing mate lid wouldn't mix it well enough. Onto another question...

Has anyone tried Ekopoxy over alodine? I spoke to Stewart Systems and they said it would work, but suggested I rough it up with a scotchbrite pad first. I've never alodined but from what I have read it seems scotchbrite would probably wear through it. Any thoughts?

Btw, my experience with ekopoxy was pretty good. I got a pretty rough sandpapery finish but it was quite tough and smooth enough for plane internals. Will experiment a bit more with the gun settings next time.
Scotchbrite will scuff off some of the alodine layer. It's quite thin.
I have no experience with Ekopoxy but if it were a solvent basdd paint, I would thin it more. I had a slight rough surface with Jet Flex. After it hardened, I scrubbed with a claybar and it made it smooth.
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  #20  
Old 09-23-2019, 08:53 AM
jacoby jacoby is offline
 
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Quote:
Originally Posted by GPV View Post
Btw, my experience with ekopoxy was pretty good. I got a pretty rough sandpapery finish but it was quite tough and smooth enough for plane internals. Will experiment a bit more with the gun settings next time.
That's usually from not enough paint being sprayed. Check your input pressure (too high), that your paint flow is set to max (if your gun has one; not the needle/trigger stop) and that you have a proper fan (full paint in the middle with a sprayout on the edges). For smaller parts I generally set the gun for about a 2-3" spray width and a 5-6" total fan. Larger areas you can go up to a 5-6" spray with an 8-10" fan.

You may need to go to a larger tip size. Also be sure to setup the trigger correctly. Don't try to modulate spray with the trigger. You should be able to pull to the stop every pass.

If you're using the little filter that comes with the gun throw it away. Use cone filters when filling the cup.

Keep the vent on the cup clean! If it clogs you'll get low/no flow and a rough texture.
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