Phosphoric acid is the right stuff. I used it in the early stages of my roadster refurb in 2015-2018. As well as many projects before and since. I started off using Rust Mort, manufactured by SEM. SEM specializes in products for the auto body industry. It is a top notch product but very expensive though it goes a long way. More recently I have been using "Delimer" that I get from the manufacturer that I work for. Before using the delimer you want to have cleaned off all the rust that you can with your cup type twisted wire wheel in your grinder. I follow the Rust Mort instructions. I use it STRAIGHT. Being watery thin it takes very little. I brush it on with one of the small brushes that you use for soldering paste. I keep it wet for a good 15 minutes agitating frequently with the application brush. The chemical needs a little mechanical help to move the loosened rust aside. It needs aggressive rinsing. I toss small parts into a bucket of water, larger parts need pressure washing. Excess that is not rinsed off will show up as white residue once dried. You don't want very much under your primer.
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Today's Featured Article - Identifying Your Tractor - by Staff. Maybe you bought it from a friend who didn't know what kind of tractor it was, or perhaps (and this is every tractor fanatics dream) you stumbled across it in an abandoned field covered with weeds but intact. In any case, you have no idea what the make and/or model is. For awhile perhaps it doesn't really matter. Especially if it runs! But pretty soon you'll probably need to tinker with it a bit and maybe buy a part or too. Having a manual is nice. But how does one go about dete
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