The floor panel is solid and has some surface rust with areas of pitting on the interior. There is good paint and then spots with this rust. I just want to encapsulate the rust since 80% of the floor is good. What rust conversion products have you used with good results? Most say to use a water hose to remove the acid. It might be difficult to do this inside the vehicle.
Spray with Ospho, Ace hardware carries it. Follow directions and when cured paint with whatever you want.
Depends on the car...if there aren't any holes in it, or they're just small holes and it's still solid, and it's just a car to drive, I'll leave the rust alone and park inside, and it won't ever get worse. I live in Arizona, so your results may vary. for something I want to do a high quality job, I either replace the metal or blast the rust and paint it. Although my days of doing that are over now, mostly.
If you're looking for a simple solution, Ospho is it. And since you ask, you don't need to rinse it with water. I've also had decent results with Eastwood's rust encapsulation paint. Of course, all these solutions are just shots in the dark without pictures of what you're dealing with.
I use the brush on Ospho. I welded in some patches on the roof of my coupe that had rusted through, back in 2011. There were still other places that had some deep pits. I bought the brush on Ospho and followed the directions. This is one of those areas, in 2018. This is how much of that area I replaced in 2018. This is how that area looked last summer. The car sits outside all year around.
My rust is not that bad. I might be able to sand the rust out however I don't want to thin the metal.
The metal around those pits was sanded before the Ospho treatment, should have seen it before that! That area has been sanded several times by now. The pictures just highlight how deep the pits were (and still are), and how they have not expanded after the treatment (no expanded rust from the original pits, and no new pits). The cut out section shows the condition of the surrounding metal (inside of an enclosed section of the body). The area that was replaced was paper thin in 2011. I didn't expect the car to last more then a couple years back in 2011, so for it to make it to this point gives you an idea how well the Ospho has worked for me. 14 years and still going. Could I have treated inside of the enclosed area, it likely would have been in much better condition when it was cut open in 2018. There is a difference between sanding a surface you want to save, and trying to grind out rust pits. You can't grind out rust pits, you either replace the metal, or you sand lightly, treat it, finish it, and hope for the best.
I use the 3M black stripping "rice cake" wheel in a drill, it does not take off any metal, only paint and rust. Unlike a wire wheel it will not throw sharp wires at you or dig into shallow pits turning them into holes, but cost more and last not as long. Stay away from sharp edges and it will last a good while.
I been using Ospho. Just before spraying primer to seal, wiped down with Solvent(de-nurtured alcohol or what ever, ) no water, just before primer
This was after a paint stripping disk. Pitted rust can be difficult. Then this was after using rustoleum rust remover gel ( gel for curved surface). Cheap and you can buy it at Menards. On a flat surface, like your floor I'd use citric acid mixed with water. Can also soak that with a smooth rag and keep wet. If you have pitted rust or not is the question.
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