Hi,

I bought zinc-rich galvanizing compound to fix rust on my F250 and decided to evaluate it before trying it on my truck ($$$).


I cut a piece of metal wool into two pieces.

I took normal anti-rust paint, sprayed 1 shot on a piece of wool.

I took zinc paint, sprayed 1 shot on another piece of wool.


I left them both dry for about 1 hour.


I cut two water bottles open, put the same amount of water & 1 table spoon of salt in each.


I put 1 piece of wool in each bottle.


Results after 24 hours:



Left = Normal Anti-Rust Paint
Right = Zinc Paint

 

Which is which? And shouldn't the galvanizing compound require electrolysis of some kind? such as acid etch, electronic, high temps, ect?

 

Zinc: It's says to simply spray it on the can :P

 

And a picture's worth a thousand words?.....

 

1000 words (from wikipedia, Zinc - Wikipedia, the free encyclopedia)
Zinc is more reactive than iron or steel and thus will attract almost all local oxidation until it completely corrodes away.[94] A protective surface layer of oxide and carbonate (Zn5(OH)6(CO3)2) forms as the zinc corrodes.[95] This protection lasts even after the zinc layer is scratched but degrades through time as the zinc corrodes away.[95] The zinc is applied electrochemically or as molten zinc by hot-dip galvanizing or spraying.[10] Galvanization is used on chain-link fencing, guard rails, suspension bridges, lightposts, metal roofs, heat exchangers, and car bodies.[10]

 

Are you using a product like the Krylon Sprayon® Zinc-Rich Cold Galvanizing Compound ?

 

Yeah, but not that one.

 

I've used both ZEP's cold galv and Krylon. Zep's is heaver thicker but both seem to really work great. I've been using it for years as under coat on trailer repairs then top coated with enamel paint with universal hardener. never had to re work those spots ever again.
The past 4 years I've used it on the thin wall header tubes on the race car. Smokes like hell 1st time to run the car but it last a full season and keeps the rust down. Ceramic coating lasted less then a full season and cost 5 times as much. 1100cc bike motors running at 12500rpms the headers get hot quickly.

44

 

Yeah, this stuff is good.. I just wonder why I can't easily buy it in Canada :S