Like Tree0Likes

Galvanizing: hot dipped versus cold spray

Reply
Old 01-22-2008, 03:59 PM
  #1
Registered
Thread Starter
 
Join Date: Aug 2006
Location: IAD/FLL
My Boats: '77 Hornet II
Posts: 2,090
Default Galvanizing: hot dipped versus cold spray

I imagine hot-dipped is the best for all around protection. But I'm really wondering what the consesus is on "galvanizing in a can." I picked up a can of Rustoleum brand to try on some parts. So far only sprayed it on the backing plates of a buddy's disc brake trailer; haven't dunked it in the salt yet. But it looked real nice and shiny!

Would the cold spray work on things like non-galvinized hubs, updating galvanized wheels, trailer brackets, etc.?
handfulz28 is offline  
Reply With Quote
Old 01-22-2008, 04:05 PM
  #2
Registered
 
JLAY's Avatar
 
Join Date: Jun 2005
Location: Chalmette,Ponchatoula, Louisiana
My Boats: 14' go-devil mud boat 22' Apache Scout
Posts: 408
Default

I work in the water/wastewater industry and use hypochlorite (bleach) and gas chlorine alot. The were eating all of the mounts for our pumps. I had the welder fab some mounts and sandblasted them. As soon as i cleaned the sand off of them i sprayed them with some cold gal. spray and they lasted longer than anything we were buying! You have to compare and make sure you buy the stuff with the high zinc content.
JLAY is offline  
Reply With Quote
Old 01-22-2008, 04:05 PM
  #3
Platinum Member
Platinum Member
 
CigDaze's Avatar
 
Join Date: Jun 2001
Location: St. Petersburg, FL
My Boats: Cigarette 35 Cafe Racer
Posts: 21,346
Default

Hot-dip galvanizing is a process whereby iron and steel components are passed through molten zinc. This does two things: (1)provide a physical barrier to corrosion since zinc is far more corrosion resistant than steel and iron and (2)it chemically adheres to and alters the surface layer of the iron or steel component effectively making the ferrous component cathodic, lowering it's ionizing potential and thus diminishing surface corrosion. You'll never compete with this process using something in a can. The best you can hope for is a temporary physical barrier, but the chemical surface conversion will not occur. I'm sure the rustoleum can't hurt, but...
CigDaze is offline  
Reply With Quote
Old 01-22-2008, 05:12 PM
  #4
Registered
 
Join Date: Jun 2005
Posts: 9,590
Default

I use the can spray on pool chemical trailers and it does ok. The trailers are hot dipped but I make some changes (new welding) and spray everything when I am done. It holds up good but the acid will rip right through the can spray results. The chlorine (bleach) doesn't eat it up too bad. Salt water should not be that bad.
Jupiter Sunsation is offline  
Reply With Quote
Old 01-22-2008, 07:41 PM
  #5
Ginger or Mary Ann?
Charter Member
Trade Score: (1)
 
US1 Fountain's Avatar
 
Join Date: Oct 2000
Location: Lafayette. IN
Posts: 10,871
Default

Don't know about the salt water reliabilty.... but I've used the spay can galv. stuff on a few parts of my lift I added. 5 yrs later, no rust on those parts and they still looks like the day I sprayed them. I thought there was no way a spray can product was going to protect steel parts that are underwater everytime the lift goes down. I'm amazed.
My marina sprays all the welds from dock repairs and such and those spots hold up just fine too.
US1 Fountain is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bajabob
Do It Yourself, Boating on a Budget
3
07-14-2008 09:07 AM
Blue by You
General Q & A
17
05-07-2006 11:44 AM
21 Hustler
General Boating Discussion
15
02-08-2004 10:43 AM
Ric232
General Q & A
1
03-02-2003 11:44 AM



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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 12:17 PM.


Copyright 2011 OffShoreOnly. All rights reserved.