Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Farmall & IHC Tractors Discussion Forum
:

Kind/Brand of Primer to use after Phosphoric Acid

Welcome Guest, Log in or Register
Author 
Dave in CT

09-13-2005 07:00:03




Report to Moderator

I'm painting some half-rusted and fully rusted metal. I've been removing the majority of the rust with a twisted wire brush on a grinder and then treating the metal with Must-for-Rust (phosphoric acid). What type or brand of primer have folks had success with after this type of treatment? Also, the resulting surface after this treatment can have glossy spots. Do I need to break up that gloss by light sanding or will that just be wearing away the protective residue of the Must-for-Rust?

[Log in to Reply]   [No Email]
CNKS

09-13-2005 07:12:02




Report to Moderator
 Re: Kind/Brand of Primer to use after Phosphoric A in reply to Dave in CT, 09-13-2005 07:00:03  
What I usually do with such products is use a scotchbrite pad, or similar product and remove as much of the residue as possible. I then treat with wax and grease remover -- I use PPG DX330. I also use PPG Omni MP 170 epoxy primer. Whatever you do don't use etch primer after a phosphoric acid treatment -- there is the possibility of too much acid. I have not yet painted over "Must for Rust", although there are some parts ready to paint. Thus far I have only used Picklex 20, I don't think there is much difference except for cost, but I don't know the formulations -- My guess is you will be fine. As far as breaking up the finish, if you paint it within a reasonable amount of time after scuffing or sanding, it shouldn't be a problem, as the epoxy seals the metal and prevents moisture from getting in. That is one advantage of epoxy primers, they are waterproof, other primers aren't.

[Log in to Reply]  [No Email]
Dave in CT

09-13-2005 07:37:39




Report to Moderator
 Re: Kind/Brand of Primer to use after Phosphoric A in reply to CNKS, 09-13-2005 07:12:02  
Do these primers have hardener - i.e.: require the forced air breathing mask for safe application? My occasional painting requirements are to get the metal protected and looking decent, not show-ready, so I'm avoiding major investments. On the other hand, if someone tells me such systems mean the difference between painting again in five years vs. thirty, it would be something I'd consider.



[Log in to Reply]  [No Email]
CNKS

09-13-2005 10:56:34




Report to Moderator
 Re: Kind/Brand of Primer to use after Phosphoric A in reply to Dave in CT, 09-13-2005 07:37:39  
Tim is correct, you only need a charcoal mask for most epoxy primers, just be sure to check the one you use. Omni MP 170 also has the 3 day window, you have to scuff and reapply (not necessarily sand) after the 3 days. More expensive ones have longer windows -- up to a week, but as far as I know you can't store any parts for any length of time without reapplying.



[Log in to Reply]  [No Email]
Dave in CT

09-13-2005 11:53:41




Report to Moderator
 Re: Kind/Brand of Primer to use after Phosphoric A in reply to CNKS, 09-13-2005 10:56:34  
Just talked to the local PPG auto parts store - only place nearby that sells the stuff. The guy I spoke to said I had to use the hardener with the MP 170 or else it would never dry. The price for the primer + hardener was eighty-something dollars for a gallon. Does this sound right as far as use of the hardener and the price? As far as I'm concerned, any time I start using the hardener, I need the forced air mask.

[Log in to Reply]  [No Email]
CNKS

09-13-2005 12:28:44




Report to Moderator
 Re: Kind/Brand of Primer to use after Phosphoric A in reply to Dave in CT, 09-13-2005 11:53:41  
You can go to the PPG web site and look up the MSDS. I assure you that the catalyst for MP 170 does not contain isocyanates. I paid $77 a couple of years ago, so the price is in line. I just tried the web site and the MSDS part is down, go figure. Again the hardener does not contain iso's, if it did I would be dead. That is the only part of my painting that I don't use my supplied air system. I am positive. Epoxy hardeners are the only ones I know of that don't.

[Log in to Reply]  [No Email]
Dave in CT

09-13-2005 12:48:25




Report to Moderator
 Re: Kind/Brand of Primer to use after Phosphoric A in reply to CNKS, 09-13-2005 12:28:44  
Thanks CNKS. I'll go with your recomendations.



[Log in to Reply]  [No Email]
Tim...Ok

09-13-2005 08:08:59




Report to Moderator
 Re: Kind/Brand of Primer to use after Phosphoric A in reply to Dave in CT, 09-13-2005 07:37:39  
Dave, Most,if not all of the epoxy primers only require a charcoal mask..I've been using the Nason..only thing i don't like about it is the relatively short window you have for getting the topcoat sprayed..on mine it's 3 days..go over that and your supposed to scuff the epoxy,spray another coat of it,then get your topcoat on within that 3 day window... kinda tight window for a part timer like myself..I'd like to be able to clean and prime parts at my leisure,then have a painting day to put the color on..

Tim

Tim

[Log in to Reply]  [No Email]
CNKS

09-13-2005 10:59:12




Report to Moderator
 Re: Kind/Brand of Primer to use after Phosphoric A in reply to Tim...Ok, 09-13-2005 08:08:59  
But, you can use Picklex type products and keep them from rusting indefinitely, then prime and paint.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy