Take the 2-minute tour ×
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

I want to use a piece to replace damaged round downspout of same diameter. I plan on priming and painting it, but the primer I have on hand says not to use on galvanized metal. It has a smooth black finish and there is a little bit of rust on some of the edges. It doesn't have the silver/gray that I am familiar with (as used, for example, for HVAC ducts). I have Googled my question without success.

share|improve this question
3  
It normally isn't but I have seen it used. Do you have a picture? –  DMoore Sep 26 '13 at 3:55
    
Thanks for the reply. I don't have a picture yet. I can tell you it is a smooth black finish and there is a little bit of rust on some of the edges. It doesn't have the silver/gray that I am familiar with (as used, for example, for HVAC ducts). Is that enough to go on? –  Mad Monty Sep 26 '13 at 21:06
1  
We can't really give an answer other than "it might be". –  DA01 Sep 26 '13 at 22:05
    
NFPA 211 - 12.4.1.2 Galvanized steel pipe shall not be used for solid fuel-burning appliances. –  Fiasco Labs Oct 28 '13 at 2:35
    
that's helpful. Although I'm not sure the pipe was intended for solid fuel (versus gas or oil, for example), your information lessens the chance that is galvanized. –  Mad Monty Oct 30 '13 at 21:02
add comment

2 Answers 2

Given the black finish on my pipe, I conclude it is either not galvanized, or if it is, it has already been painted with an appropriate coating. My universal primer (Universal except for galvanized)Should adhere fine. Thanks to dopeyBob.

share|improve this answer
add comment

I believe the do not use on galvanized metal is due to the slickness of the finish already on it (silver/gray natural galvanized finish). If there is another painted/coated finish on the pipe then it will likely be fine to paint but keep in mind it may chip or flake faster than the original downspout.

I do not know of a safety issue with painting galvanized metal like there is for burning galvanized metal, if someone is aware of one please let me know in comments.

Here is additional comments relating to the subject. http://www.handymanclub.com/connect/forums/aft/34546

share|improve this answer
    
thanks – this is most helpful, and the link give a great explanation of the adhesion issues with galvanized. Given the black finish on my pipe, I conclude it is either not galvanized, or if it is, it has already been painted with an appropriate coating. My universal primer (Universal except for galvanized)Should adhere fine. –  Mad Monty Oct 30 '13 at 21:07
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.