I seen something on a show American Chopper to be exact. I have not found out from their site what it was so I'll ask here. They had some guy restore and 1914 Indian motorcycle he first sprayed it with something that converted the rust to something else and it brought out some of the original color of the bike. This gave the bike a look like it had been coated with a stain. He said that this method stopped all rust while he waited to start the disassembly and restore. He said some people would just leave them like that to. I was thinking if I could find out what he used I might try that on my old Tractor. Anyone have a clue what I'm talking about?
- Thread starter akdonkey
- Start date
showcrop
Well-known Member
There are many different products out there that are just phosphoric acid, which will convert rust to iron phosphate. Anything with rust on it should be washed with acid after cleaning and before priming, especially cast, because you can't be sure of getting down into all the little depressions to get rust off. I used one of the name brand products, and it worked well, wherever there was rust left it turned it shiny black. Then I looked at the label and saw that it was just phosphoric acid so I tried some and it worked the same. You can get phosphoric acid from any restaurant supply. It is sold as mineral film remover. get a bottle of the expensive stuff first so you know how to use it properly.
charles todd
Well-known Member
I use a converter trade name OSPHO. It is phosphoric acid and some other ingredients. Works great and has yet to cause paint to lift w/o using primer.
CT
CT
charles todd
Well-known Member
The OSPHO is the primer. The company claims its product is a rust converter AND primer in one. I have done it both ways.
If you are doing sheet metal or other product, I'd prime and use a high build primer so the surface can be smoothed out. For general use (ie: box blade, disk harrow, other non-critical finish smoothness) paint directly to the OSPHO'ed surface.
It is advisable to use a scotch brite pad after the OSPHO dries and converts to remove the crystals and scale that the product can leave on the surface.
Sorry for the confusion.
CT
If you are doing sheet metal or other product, I'd prime and use a high build primer so the surface can be smoothed out. For general use (ie: box blade, disk harrow, other non-critical finish smoothness) paint directly to the OSPHO'ed surface.
It is advisable to use a scotch brite pad after the OSPHO dries and converts to remove the crystals and scale that the product can leave on the surface.
Sorry for the confusion.
CT
charles todd
Well-known Member
OSPHO is just a phosphoric acid solution. It is not pure phosphoric acid, but acid with some other performance additives. You can prime or paint over the cured OSPHO. I buy it at a local hardware store for about $24/gal.
From their website:
"When applied to rusted surfaces, it resists/retards rust in chemical change on drying to a tough, hard surface ready for priming. A paint job will last longer after an application of OSPHO because subsequent paint coating securely attaches itself so that moisture and oxygen normally do not attack the metal. OSPHO is water-thin, can cover a larger area than paint, and goes on easily. It is equally effective for exterior and interior work alike. SKYCO OSPHO: a balanced formula of Phosphoric, Dichromate, Wetting Agents and Extenders . . . compounded exclusively by the Skybryte Company since 1947 ... recommended by paint manufacturers."
LINK to OSPHO site.
http://www.ospho.com/
Enjoy,
CT
From their website:
"When applied to rusted surfaces, it resists/retards rust in chemical change on drying to a tough, hard surface ready for priming. A paint job will last longer after an application of OSPHO because subsequent paint coating securely attaches itself so that moisture and oxygen normally do not attack the metal. OSPHO is water-thin, can cover a larger area than paint, and goes on easily. It is equally effective for exterior and interior work alike. SKYCO OSPHO: a balanced formula of Phosphoric, Dichromate, Wetting Agents and Extenders . . . compounded exclusively by the Skybryte Company since 1947 ... recommended by paint manufacturers."
LINK to OSPHO site.
http://www.ospho.com/
Enjoy,
CT
thegooseisloose
Member
Is that the best on you've used in your experiences or the only one? Just trying to see if there are any other options
charles todd
Well-known Member
There are other similar solutions, I'm sure. I am not endorsing this particular brand by any means! This particular product is available locally, which is why I have only used OSPHO.
Several people I know have also used OSPHO. Another engineer that I work with swears by it and uses it on EVERYTHING he paints.
CT
Several people I know have also used OSPHO. Another engineer that I work with swears by it and uses it on EVERYTHING he paints.
CT
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