Is the paint bubbling on the steam radiator from pinhole leaks? See Pix.

Reply

  #1  
Old 05-23-20, 07:18 AM
D
Member
Thread Starter
Join Date: Nov 2003
Location: USA
Posts: 281
Received 0 Votes on 0 Posts
Is the paint bubbling on the steam radiator from pinhole leaks? See Pix.

Hi,

I have a one pipe steam system in a 100 year old house. I painted this radiator a few years ago. The tenant is moving out and there is such bubbling all over the radiator. Is it caused by pinhole leaks?

Keep in mind that when this was painted it was at least a week from then it was painted until it heated up from the steam heat. And it did not bubble up then. But over the years it has.

Best,
Dave
 
Sponsored Links
  #2  
Old 05-23-20, 10:27 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 56,382
Received 747 Votes on 702 Posts
It's not a steam leak. Paint wouldn't stop steam it would be shooting out.
Possibly the paint was put on over rust and the rust is increasing over time.

Radiators need to be wirebrushed down real good and painted with a high heat rated paint.
 
  #3  
Old 05-23-20, 11:39 AM
M
Forum Topic Moderator
Join Date: Mar 2005
Location: USA - N.E.Tn
Posts: 46,965
Received 207 Votes on 184 Posts
I agree, paint won't stop a leak. I haven't been around steam heat in a long time but I'd also suspect poor prep. Do radiators sweat?
 
  #4  
Old 05-23-20, 05:18 PM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 14,231
Received 22 Votes on 20 Posts
No. Radiators don't sweat, at least I've never heard of one.
 
  #5  
Old 05-23-20, 05:24 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 24,847
Received 439 Votes on 401 Posts
Even if it wasn't poor prep it could be rust spots that have since occurred under the paint. Scrape one off.
 
  #6  
Old 05-23-20, 09:19 PM
S
Member
Join Date: Oct 2013
Location: United States
Posts: 2,927
Received 40 Votes on 38 Posts
D,
It may be a stretch but I have a question. Is your paint bubbling on the other side of the rad or just by the vent. If it is just by the vent I'm thinking it may be a bad vent leaking steam constantly when the heat is on bubbling the paint just like paint on a some bathroom ceilings that bubbles and peels from constant moisture over time. You can check that easy enough by running the heat and checking the vent.
 
  #7  
Old 05-26-20, 09:45 AM
D
Member
Thread Starter
Join Date: Nov 2003
Location: USA
Posts: 281
Received 0 Votes on 0 Posts
About the bubbly paint on the radiator - see pix

Hi,Name:  bubbles.2.jpg
Views: 61
Size:  10.7 KB

OK, sorry for the delay. The first three fins of the radiator closest to the vent are bubbly. And even on the back side of those fins they are bubbly. Further on - past them - closer to the valve - they are not bubbly. I sliced a big bubble open, you can see there might not be rust. See attachment.

Dave
 
  #8  
Old 05-26-20, 07:19 PM
D
Member
Thread Starter
Join Date: Nov 2003
Location: USA
Posts: 281
Received 0 Votes on 0 Posts
About the bubbly paint on the radiator - see pix

Hi,Attachment 115419

OK, sorry for the delay. The first three fins of the radiator closest to the vent are bubbly. And even on the back side of those fins they are bubbly. Further on - past them, the remaining three - closer to the valve - they are not bubbly. I sliced a big bubble open, you can see there might not be rust. See attachment.

Dave
 
  #9  
Old 05-27-20, 02:50 AM
M
Forum Topic Moderator
Join Date: Mar 2005
Location: USA - N.E.Tn
Posts: 46,965
Received 207 Votes on 184 Posts
If it's just near the valve and there isn't any rust under the bubbles - I'd suspect steam/vapor from the valve.
 
  #10  
Old 05-30-20, 12:31 PM
rbeck's Avatar
Member
Join Date: Jul 2007
Posts: 2,471
Received 5 Votes on 4 Posts
Were they pained with an oil base paint? Should be primed with latex paint and top coated with an oil base paint.
 
  #11  
Old Yesterday, 02:22 AM
M
Forum Topic Moderator
Join Date: Mar 2005
Location: USA - N.E.Tn
Posts: 46,965
Received 207 Votes on 184 Posts
Why would anyone use a latex primer over cast iron ??
 
XSleeper voted this post useful.
  #12  
Old Yesterday, 12:39 PM
S
Member
Join Date: Oct 2013
Location: United States
Posts: 2,927
Received 40 Votes on 38 Posts
This sight below might help you or you can go to youtube for more info.

https://www.google.com/search?q=best...obile&ie=UTF-8

Hope this helps a little.
 
  #13  
Old Yesterday, 03:29 PM
G
Member
Join Date: Oct 2008
Location: USA
Posts: 2,942
Received 10 Votes on 10 Posts
Crane Company cast-iron baseboards

My house, built in the early 1950s, has Crane Company cast-iron hot-water baseboard radiators (technically "convectors," since some or much of the heat is emitted through air flowing by convection through the unit and the internal steel fin-tubes). Our cast-iron convectors have been painted at least twlce, but the last time was with ordinary flat-latex paint. The convectors work fine and the paint has held up well. Latex paint is easier to apply and clean up than oil-based - and you can match the wall paint.

The Crane Company no longer manufactures convectors. But, in surfing the internet, I noticed that one or more companies still make them. They last a lifetime, and perform better than the modern aluminum fin-tube baseboards. For conventional hydronic radiators, I would not hesitate to use latex paint.






 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: