Posted by Ron-MI on August 25, 2022 at 21:39:46 from (47.33.247.156):
Greetings,
I got a gallon of 85% food grade phosphoric acid for rust treatment on some old ford fenders and hood off of a 640 - the sheet metal is well beat up (before I got the tractor). This is a work tractor and it will be very loved helping around the farm; my only goal is to preserve it. I wanted to test out using the phosphoric acid before I used it on a restored item so I figured this would be a great chance.
Now, Looking over the internet, I have heard many ways to use the phosphoric acid, some say use it straight up, neat without cutting it. Others say to reduce it 4 to 1 with water. Still others say to dillute it to 12 to 1. Some say to let it dry for 24 hours, others say to rinse it off in 30 minutes.
Everything on the internet is always correct, right? Well, I have found that the people on this group are very good and in the past I have gotten lots of great advice; you have not steered me wrong. So, what to do you reccomend?
I am going to prime it with Rustoleum gray primer K7781, and use the rustoleum farm & implement paint in ford gray to top coat it. I will be spraying it with a HLPV gun from harbor freight. Ackward spots may get brushed.
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