Ospho question.

A

Anorexicvega

I have a 58 ford i stripped to bare metal. It had quite a bite of deep surface rust, so i applied ospho. Let dry for 48 hours, re-wetted with ospho, rinsed after 3-4 minutes thoroughly. Everything is flash rusting, is this normal or am i doing something wrong? I was under the impression, after rinsed the metal could sit without rusting?
 
Do a test just for grins. Mix some epoxy and spray a small spot right over that flash rust. Wait 2-3 days then sand that spot with 80# back to metal. You will be amazed.
 
Is there a way too keep the flash rust too a minimum when final rinsing the ospho? All epoxy or the spi epoxy? Im sure if it has etching properties it converts the flash to something else.
 
Rinse with distilled water, dry soon after with leaf blower or dry air. All epoxies are not equal, SPI is awesome in every way.
 
Is there a way too keep the flash rust too a minimum when final rinsing the ospho? All epoxy or the spi epoxy? Im sure if it has etching properties it converts the flash to something else.
People seem to like the dawn dishwashing liquid. I am pretty sure that would slow it down in your final rinse.
 
flash rust is a false indicator . much of it depends on your water supply . good clean metal is going to flash rust . it is no problem. if it bothers you simply scrub with scotchbrite and epoxy .
 
I'll add to this that a medium to slightly firm stiffness rotary wire brush in a drill or angle grinder is great for removing flash rust & if you go at it from all 4 directions can be great for cleaning out light pits. Grinder is obviously faster mostly due to larger size wheels available.
 
Most of us on here use ospho type products to remove rust, not as a neutralizer. The way you say "quite a bit of deep surface rust" it seems like you may need to blast the areas if it is pitted rust.
 
Most of us on here use ospho type products to remove rust, not as a neutralizer. The way you say "quite a bit of deep surface rust" it seems like you may need to blast the areas if it is pitted rust.
I have two cars with similiar situtations, both after da'ing with 80 grit for an excessive amount of time there's lil black specks of which i assume is rust. It's not pitted. I'll take some photo's and post them if needed.
 
I have two cars with similiar situtations, both after da'ing with 80 grit for an excessive amount of time there's lil black specks of which i assume is rust. It's not pitted. I'll take some photo's and post them if needed.
Those little black specs is where the ospho comes in handy. No matter how much you sand sometimes there can be small to microscopic specs of rust. Blasting is not always feasible on certain panels (big flat hoods and roofs) and ospho is a solution that works.
 
Media blasting is the way to go if you don't want to sand all your metal off trying to get rust out of deep pits.
Keep the pressure down, spray at a slight angle and be sure not to overheat your panel. It is not the media that warps panels, it is the guy operating the equipment.
 
Those little black specs is where the ospho comes in handy. No matter how much you sand sometimes there can be small to microscopic specs of rust. Blasting is not always feasible on certain panels (big flat hoods and roofs) and ospho is a solution that works.
That was my concern with blasting, if some specks were missed or warping the panels. I opted to sand what i could and ospho the black specs. i blasted all the jambs but im leery of blasting the flat surfaces as i've never done it. I know the angle deal so some of the energy is deflected off and dont stay in one area too long.
 
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