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Old 03-22-2015, 01:04 PM   #1
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Default Painting Galvanized EMT Conduit

Ok guys. I have a Post and Beam contemporary house where they have run cat5 wiring on the walls. Also there is some exposed Romex in a few places on the ceiling.
Homeowner wants to encapsulate both these types of wires in Galvanized EMT Conduit and have the conduit painted a bronzed type color to match the barn-board walls. They also want to install this conduit as curtain rods to match and paint the same color.
I'm worried about the curtain rods chipping since they will be used on large windows with heavy drapes and with some kind of metal clips, and opened and closed every day.
I'm thinking about washing with vinegar, sanding with 220, then washing with vinegar again. At this point can I go with an oil-base metal paint or should I use some sort of etching primer. Everything is interior and will only be exposed to strong sunlight.
Any biters
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Old 03-22-2015, 02:36 PM   #2
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Oil primer won't hold to galvanized for long. Use stix or some other WB primer. I'd be leary of the curtain rods seems like it's bound to fail at some point.
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Old 03-22-2015, 03:15 PM   #3
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If the conduit is a galvanized metal, I would think it appropriate to use a DTM acrylic as a primer. I'm not sure an oil is necessary. Then again, I've never dealt with this exact situation before. I understand your concerns for durability.
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Old 03-22-2015, 03:51 PM   #4
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alkyd wont hold. Wash it with ammonia first
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Old 03-22-2015, 04:34 PM   #5
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Quote:
Originally Posted by SemiproJohn View Post
If the conduit is a galvanized metal, I would think it appropriate to use a DTM acrylic as a primer. I'm not sure an oil is necessary. Then again, I've never dealt with this exact situation before. I understand your concerns for durability.
I was checking out a site that references the NEC recommendation for corrosion control on EMT, and they describe using acrylic paint but never oil or alkyd.

Now the OP has a couple of things going on here.

1. He needs to match the aesthetic decor of the room. Simple solution would be to apply a couple of coats of a DTM as Semiprojohn suggested. Prep should be no more then a mild degreaser given that there is unlikely any passification.

2. The OP also needs a coating that will hold up to the friction caused by curtain hooks sliding from one end to the other. Depending on the frequency of sliding, a powder coating might be the best abrasive resistant coating for this application. You'd be surprised just how affordable powder coating is.

Last edited by CApainter; 03-22-2015 at 04:42 PM..
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Old 03-22-2015, 05:12 PM   #6
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What about a water born pre cat epoxie
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Old 03-22-2015, 05:27 PM   #7
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Quote:
Originally Posted by CApainter View Post
I was checking out a site that references the NEC recommendation for corrosion control on EMT, and they describe using acrylic paint but never oil or alkyd.

Now the OP has a couple of things going on here.

1. He needs to match the aesthetic decor of the room. Simple solution would be to apply a couple of coats of a DTM as Semiprojohn suggested. Prep should be no more then a mild degreaser given that there is unlikely any passification.

2. The OP also needs a coating that will hold up to the friction caused by curtain hooks sliding from one end to the other. Depending on the frequency of sliding, a powder coating might be the best abrasive resistant coating for this application. You'd be surprised just how affordable powder coating is.


I never thought of powder coating as an option. That does seem to be an excellent suggestion, as it should hold up better than any type of paint.
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Old 03-22-2015, 06:11 PM   #8
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Quote:
Originally Posted by CApainter View Post
I was checking out a site that references the NEC recommendation for corrosion control on EMT, and they describe using acrylic paint but never oil or alkyd.

Now the OP has a couple of things going on here.

1. He needs to match the aesthetic decor of the room. Simple solution would be to apply a couple of coats of a DTM as Semiprojohn suggested. Prep should be no more then a mild degreaser given that there is unlikely any passification.

2. The OP also needs a coating that will hold up to the friction caused by curtain hooks sliding from one end to the other. Depending on the frequency of sliding, a powder coating might be the best abrasive resistant coating for this application. You'd be surprised just how affordable powder coating is.
I will take a look at the powder coating.
Too bad the conduit isn't just plain steel on the outside. would probably make painting easier.
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Old 03-23-2015, 07:57 AM   #9
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Avoid the oil primer and oil finish as it will react to the galvanize metal and peel. Prep with vinegar and use a water based metal primer such as Procryl. Finish with Shurcryl or DTM.
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Old 03-23-2015, 08:33 AM   #10
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Saponification is the word of the day.
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Old 03-24-2015, 06:57 AM   #11
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Degreaser essential, acrylic/latex straight over the cable conduit because it's a frilly ornament.
Curtain rails acrylic primer tie-coat then 2pot epoxy for the wear factor. You guys must have this inversion of the old school rule.
Save the powder coating for someone who wants a cheap thrill. Awful development although useful, if you are overloaded with the real deal.
Saponification indeed, y'all cheer me up, thanks
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Old 03-24-2015, 08:56 AM   #12
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Quote:
Originally Posted by riskend View Post
Degreaser essential, acrylic/latex straight over the cable conduit because it's a frilly ornament.
Curtain rails acrylic primer tie-coat then 2pot epoxy for the wear factor. You guys must have this inversion of the old school rule.
Save the powder coating for someone who wants a cheap thrill. Awful development although useful, if you are overloaded with the real deal.
Saponification indeed, y'all cheer me up, thanks
I try!
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Old 03-24-2015, 09:22 AM   #13
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Can't beat the thermoset/cross linking coatings for wear on the rods.
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Old 03-24-2015, 11:12 AM   #14
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Quote:
Originally Posted by riskend View Post
Degreaser essential, acrylic/latex straight over the cable conduit because it's a frilly ornament.
Curtain rails acrylic primer tie-coat then 2pot epoxy for the wear factor. You guys must have this inversion of the old school rule.
Save the powder coating for someone who wants a cheap thrill. Awful development although useful, if you are overloaded with the real deal.
Saponification indeed, y'all cheer me up, thanks
1. Did you mean aversion?

2. Powder coating is widely used in the coating industry. Particularly for performance in industrial settings. It has excellent chemical and abrasion resistance, and typically has a quick turnaround for items the size of the one discussed here.

3. By "the real deal" do you mean that powder coating would be better suited if you had many many items on a daily bases?

At the end of the day, a DTM like PPG Pitt Tech Plus or SW Procryl is all one needs for the item discussed in this thread. But you have to present the options.

Last edited by CApainter; 03-24-2015 at 11:14 AM..
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Old 03-24-2015, 11:58 AM   #15
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keep in mind that there is a range of quality in powder coatings very similar to what there is in paints. Also, there isn't nearly as much flexibility of color in powder coatings as there is with paint. You can get pretty much any color, but it can be very expensive to get a small quantity of powder made to a particular color spec.

The DTM product would be a good choice, but also keep in mind that they have that acrylic cure time issue. The longer they get to cure before being put in service the better. The "bronze" color may be an issue with the DTM products if it is a true metallic bronze that they want.
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Last edited by PACman; 03-24-2015 at 12:00 PM.. Reason: add
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Old 03-24-2015, 07:18 PM   #16
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All that conduit you see on the front walls of your local Home Depot, and snaking everywhere, they're coated with an alkyd.
I know this because years ago when they were popping up everywhere, I applied DuLux/DeVoe alkyd to a few locations.
Two coats, and go.

The struggle is REAL.
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Old 03-25-2015, 09:32 AM   #17
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Quote:
Originally Posted by WisePainter View Post
All that conduit you see on the front walls of your local Home Depot, and snaking everywhere, they're coated with an alkyd.
I know this because years ago when they were popping up everywhere, I applied DuLux/DeVoe alkyd to a few locations.
Two coats, and go.

The struggle is REAL.
Uh, why were they popping again? If they were painted to spec when that HD was built, the paint on that conduit would have lasted 20 years or more easy. I sold the paint for almost every Home Depot built in Southern California in the late 80's and 90's. The spec on that conduit was SW DTM, but is was twice as expensive than the Frazee alkyd industrial enamel, so that's what was used out there. Lasted no more than 5-6 years before it started peeling off. I am curious as to what was actually used on that conduit when it was initially painted. The GC's on those HD jobs were so overwhelmed most of the time the painters could have used horse manure to paint that conduit and they never would have known it.
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Old 03-25-2015, 09:37 AM   #18
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There's that word again! S a p o n I f I c a t I o n! Read it, learn it, live it!



http://www.paintinfo.com/cn/cnp-006.shtml
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Old 03-25-2015, 09:44 AM   #19
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or here for you SW fans.

http://www.sherwin-williams.com/home...vanized-metal/
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Old 03-26-2015, 10:37 AM   #20
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Opti-Bond Alkyd Multi-Surface Coating looks interesting. With its portland base I wonder how chip resistant it would be?

http://protective.sherwin-williams.c...3Aproduct-6769
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