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Username Post: Rusty floors        (Topic#280762)
4dr 57 
"8th Year" Silver Supporting Member
Posts: 3838

Loc: Texas Hill Country
Reg: 11-10-04
05-06-12 05:32 PM - Post#2223243    

I just read a poster asking about a rusty floor and all the responses were about using POR.
Doesn't anyone use Ospho any more? Why not? Thanks.


The trouble is you think you have time - Buddha

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Posts: 4090

Age: 64
Loc: Everett, Wa.
Reg: 02-26-08
05-06-12 05:47 PM - Post#2223251    
    In response to 4dr 57

Ospho comes in rust remover, and rust converter applications. The POR-15 is "more" like the rust converter, but is used to seal the rust primarily; that and to build up weakened, rusted, pitted metal (think along the lines of a fiberglass resin). Without a rust converter, rust continues to do it's damage. POR-15 is also used to prevent rust, by being a barrier to moister. With the nephews 51 Bus Coupe, we used a fiberglass resin, and 1/8" thick rayon type matting to strengthen his pitted floors. Hard as a rock, and solid now, and he's painted the entire floor in red primer. Better than the chicken wire and roofing sealant I found in one car I bought many years ago (63 Ranchero). Butch/56sedandelivery.

4dr 57 
"8th Year" Silver Supporting Member
Posts: 3838

Loc: Texas Hill Country
Reg: 11-10-04
05-08-12 05:31 AM - Post#2223715    
    In response to 56sedandelivery

ok, Thanks

The best rust proofer I've found is Etching Primer over bare metal. I think a lot of new car Mgfrs. still use and recommend this process, although even some good restorers will argue for epoxy primer over bare metal. oh well

Enjoyed your bio. Got any posted pics of your SD

The trouble is you think you have time - Buddha

Posts: 245

Age: 77
Loc: United States
Reg: 04-19-12
05-09-12 06:01 PM - Post#2224318    
    In response to 4dr 57

I have never heard of ospho what it it and where can I find it thanks. Ron

"5th Year" Gold Supporting Member
Posts: 643
Age: 75
Loc: Brunswick Georgia, USA
Reg: 02-08-05
05-10-12 12:18 PM - Post#2224515    
    In response to rons50chev

Ron, ospho is the brand name for phosphoric acid. I just bought a gallon jug from Home Depot but it was under a different brand name. Just ask for phosphoric acid in the paint department in Home Depot. Tom


1954 Chevy Sport Coupe, Horizon Blue, 350, 700R4
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Mike JW 
"4th Year" Gold Supporting Member
Posts: 1091
Mike JW
Loc: Arroyo Grande, CA
Reg: 01-19-06
05-10-12 03:46 PM - Post#2224580    
    In response to Tgoss

Ospho, is great stuff, just be sure and ware rubber gloves and some eye protection. First time I used it about 25 years ago I was working on a 36 Ford sprayed the under side of the car with it. Where ever it dripped on the concrete floor it ate the concrete up. Be careful with it. burns the hell out of skin. Ask me how I know. Good luck Mike

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