Paint selection for carbon steel surface which is not blasted
Paint selection for carbon steel surface which is not blasted
(OP)
Hi all.
I am working in a company that designs carbon steel products out of plate, bar and pipe material. We do not have manufacturing facility and neither we nor our fabricators have painting facility. As we obviously need to protect our products, and do not have where to paint them, we are using paint that does not require any special surface prep and paint in house. We leave pipe coated with anti-corrosive protection layer (blue or black, depending on the mill) and grind/sand off any rust accumulated on the rest of the material and weld areas. Basically prep the surface to SSPC-SP2/3 and apply the paint. For years we have been using Benjamin Moore Z24 Alkyd-Enamel (semi-gloss) brushed on. This is our standard paint procedure for service up to 350 °F. If we have a design for higher temps, we get these out to painting vendors for proper paint.
IS there anyone that can recommend any other paint that can be used for the above mentioned temperature and surface prep? Current paint is easy to use, but the finished product is something that i am not satisfied with. The surface becomes dirty rather easily and it just doesn't look too nice. I understand that without proper surface prep it is almost impossible to achieve good finish. I am just hoping that someone here can recommend something that is an improvement to the existing paint selection. I would like to stay away from epoxy coatings as those harden rather easily, want to keep it as simple as it is (we do not have a dedicated painter. whoever is free paints the equipment and sometimes, they need to be pulled away from the painting job to do something else ). We also do not like to have glossy finish. Semi-gloss, eggshell would work (not sure if this matters though).
Thanks in advance
I am working in a company that designs carbon steel products out of plate, bar and pipe material. We do not have manufacturing facility and neither we nor our fabricators have painting facility. As we obviously need to protect our products, and do not have where to paint them, we are using paint that does not require any special surface prep and paint in house. We leave pipe coated with anti-corrosive protection layer (blue or black, depending on the mill) and grind/sand off any rust accumulated on the rest of the material and weld areas. Basically prep the surface to SSPC-SP2/3 and apply the paint. For years we have been using Benjamin Moore Z24 Alkyd-Enamel (semi-gloss) brushed on. This is our standard paint procedure for service up to 350 °F. If we have a design for higher temps, we get these out to painting vendors for proper paint.
IS there anyone that can recommend any other paint that can be used for the above mentioned temperature and surface prep? Current paint is easy to use, but the finished product is something that i am not satisfied with. The surface becomes dirty rather easily and it just doesn't look too nice. I understand that without proper surface prep it is almost impossible to achieve good finish. I am just hoping that someone here can recommend something that is an improvement to the existing paint selection. I would like to stay away from epoxy coatings as those harden rather easily, want to keep it as simple as it is (we do not have a dedicated painter. whoever is free paints the equipment and sometimes, they need to be pulled away from the painting job to do something else ). We also do not like to have glossy finish. Semi-gloss, eggshell would work (not sure if this matters though).
Thanks in advance





RE: Paint selection for carbon steel surface which is not blasted
RE: Paint selection for carbon steel surface which is not blasted
RE: Paint selection for carbon steel surface which is not blasted
Are you following all of these guidelines?
RE: Paint selection for carbon steel surface which is not blasted
RE: Paint selection for carbon steel surface which is not blasted
Ron - the finish is not that bad. Brush strokes are not that visible. The finish is just the way it is. It is like a magnet for dirt.
tbulena - i believe we are loosely following that. In case the air is dry or it is colder, we would still paint. We wouldn't postpone painting just because it is, let's say, 38 degrees.
moltenmetal - 350 °F is important. I was actually hoping I would be able to increase the temp rating. inorganic zinc is out as it needs blasting, doubt that polysiloxane will be an option as it is expensive (how expensive?). With inorganic enamel what are my options? They can be found in any store in spray can, but do they come in cans/buckets? can they be brushed on? Would you be able to provide any paint recommendation from one of the brand name manufacturers (PPG, BM, SW, Jotun, International...)?
As i wrote above, our units are in process industries so we get no points for the looks. Need to protect it and that's it. For me it is important to have the following:
- at least 350 °F rating (hopefully more)
- able to be brushed on
- one part paint
- not glossier than semi-gloss finish
RE: Paint selection for carbon steel surface which is not blasted
I found a not in our system that one of our engineers had a discussion with Benjamin Moore rep, which told us at the time, that the paint is good up to 350 °F....
RE: Paint selection for carbon steel surface which is not blasted
As for epoxies....there are numerous formulations that will handle high temperatures. Check with an industrial supplier such as Intertherm, Tnemec or Carboline. Benjamin Moore's greatest market is consumers and residential contractors.
RE: Paint selection for carbon steel surface which is not blasted
You really want barbeque paint- a high temperature non-alkyd enamel. Easy to apply, 1 part, and only modestly less protective than an alkyd enamel.
RE: Paint selection for carbon steel surface which is not blasted
Thank you moltenmetal. As i do not know much about the paint i will need to ask a stupid question. Would you be able to give me an example of the paint you're talking about? I went to manufacturer's websites and they do not list anything under enamel. Inorganic or non-alkyd enamel does not help me as well.
As far as BBQ paint, there is rustoleum paint but that comes only in spray cans...
Thank you
RE: Paint selection for carbon steel surface which is not blasted
Available in spray bombs and in cans for brush use. This is just an example.
RE: Paint selection for carbon steel surface which is not blasted
Is there anything from International, Carboline or similar manufacturer ?
RE: Paint selection for carbon steel surface which is not blasted
You could use brush on exhaust manifold paint, the only problem is the stuff comes in a limit range of colors. red, grey , black. and silver.
These paints are good from 1200 to 2000 degrees F depending on color.
B.E.
You are judged not by what you know, but by what you can do.
RE: Paint selection for carbon steel surface which is not blasted
RE: Paint selection for carbon steel surface which is not blasted
Thank you for all of your help. This did help me enough to continue on my own.
Thank you
RE: Paint selection for carbon steel surface which is not blasted
RE: Paint selection for carbon steel surface which is not blasted
I'd kind of expect a light color would show dirt and liquid contamination more quickly, and I also wonder if the semi-gloss is contributing to the short lived finish.
I wonder if a catalyst additive would make the present paint finish more durable and dirt resistant.
http://www.tractorsupply.com/tsc/product/majic-cat...
Kind of poisonous at least when sprayed, and speeds up dry time, which perhaps you do not want.
RE: Paint selection for carbon steel surface which is not blasted