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Old 01-09-2017, 09:34 PM
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Rust removal on the roof

Ok guys, had a few suggestions already and all have no success. I'm rebuilding a 48 Chevy truck and I've got most of the cab sandblasted, however, I cannot seem to get the rust off the roof. I've tried blasting and it's bot working. Getting shocked instead. Tried grinding with a 36 grit flap wheel and no luck unless I really dig in but then the roof flexes and I don't want to create a ton of heat. Tried wirewheel, even 2" 50 grit pads on my die-grinder. Nothing. I just resprayed phosphoric acid on it and will clean it up tomorrow and try blasting it while it's still damp. Anyone else have the same problems with the roof getting down to bare metal and if so what was your method. Thanks!

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Old 01-10-2017, 06:23 AM
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Did you ground the truck, that will take care of the shock problem.
try getting the next coarser grit sand or new sand
your air pressure needs to be about 90 lbs or higher or try a smaller tip.
Try a hand held "speed blaster" just to see if it works.
I think your compressor is too small and you need a smaller unit (like the speed blaster) it has a tank on top that should get you finished up.
phosphoric acid will not help remove paint in any way at all. if your just trying to remove rust your going about all wrong.
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Old 01-10-2017, 07:47 AM
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Originally Posted by deadbodyman View Post
Did you ground the truck, that will take care of the shock problem.
try getting the next coarser grit sand or new sand
your air pressure needs to be about 90 lbs or higher or try a smaller tip.
Try a hand held "speed blaster" just to see if it works.
I think your compressor is too small and you need a smaller unit (like the speed blaster) it has a tank on top that should get you finished up.
phosphoric acid will not help remove paint in any way at all. if your just trying to remove rust your going about all wrong.

The phosphoric acid helped alot with removing the rust from the rest of the cab, and I didn't ground the cab yet, haven't blasted on the roof since last time. Yesterday I tried 36 grit flap wheel and wire brushes, and then 50 grit grinding disks on my die grinder. That just turned the rust on the roof black. Then I just resprayed it with the acid and I'll try it again today with a wirewheel. someone told me soda blasting will remove the rust?? I thought soda blasting only removed paint/primer...
And my sand blaster I'm using the smallest tip for it now, but I've only been running it around 60psi...just getting aggrevated because the rest of the cab was easy to blast clean but the roof is being a major pain
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Old 01-11-2017, 06:33 AM
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Are you blasting rust or paint. or both. If it WAS blasting fine at 60 lbs when you started Then what has changed? The only thing I can think of is the sand isn't sharp any more.
Be careful with that Phosphric acid if you don't know exactly how to use it, it'll create its own problems.
I use Ospho all the time (A brand of acid) so I can help with that but first ALL the paint and primer has to be off.
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Old 01-11-2017, 06:42 AM
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Are you blasting rust or paint. or both. If it WAS blasting fine at 60 lbs when you started Then what has changed? The only thing I can think of is the sand isn't sharp any more.
Be careful with that Phosphric acid if you don't know exactly how to use it, it'll create its own problems.
I use Ospho all the time (A brand of acid) so I can help with that but first ALL the paint and primer has to be off.
I got it. Just about got the roof done. Not sure what happened. I got new media, just wasn't digging in. After I sprayed more acid on the roof and let it sit overnight it came right off yesterday. Just didn't get alot of time to finish the roof lastnight. Some were saying the metal on the roof is a thinner gauge and it was flexing not allowing the media to dig in, maybe that was it. But after wetting it, it came right off. I'll be posting a picture later this morning on my build thread of a close up. Was too dusty to get a good picture yesterday. All the paint is off, and now the exterior of the cab is just about done!
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