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Antique Tractor Paint and Bodywork

Zinc Cromate

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primed and read

02-03-2004 21:31:39




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hey have any of you guys ever heard or used "zinc cromate" (not sure if I spelled that right) primer. A friend of mines dad passed away recently ( he use to be bridge painter and he has gallons of the stuff left in his basment. His son is cleaning out the house and asked me if I wanted it. He said his dad use to paint all kinds of meatle stuff around the outside (wheelbarrels, swing sets etc. with it and never paint over it and it still looks great. Could I use this stuff on my tractors? what would I reduce it with? what kind of top coat could I put over it? thanks

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Primer..John,PA

02-10-2004 07:00:53




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 Re: Zinc Cromate in reply to primed and ready, 02-03-2004 21:31:39  
The aviation industry uses zinc chromate as a primer for aluminum. Great stuff.



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Ol Chief

02-04-2004 21:14:43




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 Re: Zinc Cromate in reply to primed and ready, 02-03-2004 21:31:39  
I have'nt seen Zinc Chromate primer for many years.To my knowledge it is an oil based primer and was extensively used in the marine industry for years.When inorganic zinc primers came along the new jargon for paint became (coatings)and almost instantly the old zinc chromate and red lead oil based primers became obsolete.Reason being that the new stuff will often last for five and up to ten years in the presence of salt water conditions.While the old paint was good in can not come close to that service life.The new coatings can only be applied to freshly sand blasted surfaces to give a (tooth)to cling too. I think you will find that zinc chromate is still used on bridges and other structures that are not blasted or are not exposed to salty conditions.In marine service the practicewas generally to use three coats of any primer when brushed on.Reason being that tinyair bubbles are always included in a brushed on paint job.A single coat of paint will always bloom rust if brushed.The more it is worked the more air is included. In conclusion,I would certainly accept the offer of your friend though I have no idea of Z C compatability with modern color paints. There is the possibility that the newer Z C is not an oil base so read the label,it may be ok. At least you could use it for almost anything else or pass some to another friend.

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Larry NE IL

02-12-2004 21:09:25




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 Re: Re: Zinc Cromate in reply to Ol Chief, 02-04-2004 21:14:43  
I've built a couple planes, (pitts specials) and zinc is used extensivly in aircraft. I've painted things like engine mounts, tube frames, etc. right over the zinc, but always used the primer that went with the final finish coat on the outside.
Someone was just telling me that if you don't get two or more coats of zinc on you will get rust because the zinc attracts moisture. Don't know if that is true or not, but I do remember pieces of tubing laying around the hanger with one coat or overspray and they were had rust spots on them.

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