phosphoric acid rust removal
#41
Exactly. I use muratic acid on large body panels that blasting can work-harden and warp with blasting. The rust will actually come up through the checks and cracks in the original lacquer paint. After you remove the paint ( I use an electric buffer and a 3M 9" soft pad with 80 grit at about 1200 rpm) pour the acid on and spread it around with an old push broom or similar. This process will actually get into the pits the rust creates. It will turn yellow as it works, rinse it off with a hose (not high pressure as you don't want to splash this on anything) dry and repeat. Then I use dish soap and a scuff pad to clean thoroughly and dry and blow off, ready for primer now. Wear two pair of gloves and a respirator and a long sleeve sweatshirt and treat this stuff like it will kill you. For smaller parts a blasting cabinet is just far easier and faster but they do need a large compressor to run. For the frame/radiator support etc you need a pressure pot blaster and the room associated with doing this. Wear a respirator when using the cabinet and sand blaster also.
Do you use pure muratic acid?
#44
Exactly. I use muratic acid on large body panels that blasting can work-harden and warp with blasting. The rust will actually come up through the checks and cracks in the original lacquer paint. After you remove the paint ( I use an electric buffer and a 3M 9" soft pad with 80 grit at about 1200 rpm) pour the acid on and spread it around with an old push broom or similar. This process will actually get into the pits the rust creates. It will turn yellow as it works, rinse it off with a hose (not high pressure as you don't want to splash this on anything) dry and repeat. Then I use dish soap and a scuff pad to clean thoroughly and dry and blow off, ready for primer now. Wear two pair of gloves and a respirator and a long sleeve sweatshirt and treat this stuff like it will kill you. For smaller parts a blasting cabinet is just far easier and faster but they do need a large compressor to run. For the frame/radiator support etc you need a pressure pot blaster and the room associated with doing this. Wear a respirator when using the cabinet and sand blaster also.
#45
Well my pressure pot blaster will take the skin off your fingers very quickly if you slip up. The amount of pressure it puts to the surface is too much for wide unsupported sheet metal like roofs, trunks etc. I got an ss chevelle hood from a blaster many years ago it was absolute junk, wasn't even slightly flexible anymore. I do whatever will fit in the cabinet out of convenience as well, the sandblaster makes a hell of a mess and it's painful to use. I usually end up with sand behind my eyeballs when I use it so it only gets pulled out for the big stuff which I do all at one time.
#46
Well my pressure pot blaster will take the skin off your fingers very quickly if you slip up. The amount of pressure it puts to the surface is too much for wide unsupported sheet metal like roofs, trunks etc. I got an ss chevelle hood from a blaster many years ago it was absolute junk, wasn't even slightly flexible anymore. I do whatever will fit in the cabinet out of convenience as well, the sandblaster makes a hell of a mess and it's painful to use. I usually end up with sand behind my eyeballs when I use it so it only gets pulled out for the big stuff which I do all at one time.
#47
I was using a 25gal compressor , and that was not big enough for blasting , but it worked . I think the lower pressure may help with not warping panels , but takes forever . I cleaned up my fenders on the inside this way where the fender brace sits , and they're just fine .... a few years prior to that I was blasting some small underbody parts with a homemade cabinet with a built in exhaust fan , but I was still smelling the silica dust . This was before they outlawed silica sand . Not so smart on my part , but I didn't do that to many times ... even with a paper mask outside , you still get dust . If at all you can afford it , get a respirator like you said , as long as the filters are new you should be ok .
#48
Dude! What hard to reach areas are you talking about???!!!
#50
#51
If silica sand were outlawed, they'd have to outlaw beaches.
When I was a kid, we used to sandblast with "pool sand," and I can assure you that you can still get pool sand, and several other grades of sand as well, at any lumber yard.
The black stuff is better, though - sharper and holds less water.
- Eric
When I was a kid, we used to sandblast with "pool sand," and I can assure you that you can still get pool sand, and several other grades of sand as well, at any lumber yard.
The black stuff is better, though - sharper and holds less water.
- Eric
#52
If silica sand were outlawed, they'd have to outlaw beaches.
When I was a kid, we used to sandblast with "pool sand," and I can assure you that you can still get pool sand, and several other grades of sand as well, at any lumber yard.
The black stuff is better, though - sharper and holds less water.
- Eric
When I was a kid, we used to sandblast with "pool sand," and I can assure you that you can still get pool sand, and several other grades of sand as well, at any lumber yard.
The black stuff is better, though - sharper and holds less water.
- Eric
#53
Silica dust from sandblasting with sand is very, very bad for your lungs. The only safe way to use it is with a fresh air system.
The other media - coal granules (the black stuff), glass, walnut, etc - are much safer for you.
The other media - coal granules (the black stuff), glass, walnut, etc - are much safer for you.
#55
For those interested:
"Preventing Silicosis and Deaths From Sandblasting" by the CDC
http://www.cdc.gov/niosh/docs/92-102/
"Preventing Silicosis and Deaths From Sandblasting" by the CDC
http://www.cdc.gov/niosh/docs/92-102/
#56
For those interested:
"Preventing Silicosis and Deaths From Sandblasting" by the CDC
http://www.cdc.gov/niosh/docs/92-102/
"Preventing Silicosis and Deaths From Sandblasting" by the CDC
http://www.cdc.gov/niosh/docs/92-102/
#57
Has anyone done a direct comparison of "Blue Lightning" vs. "RPM Lightning Strip"?
They seem to be very similar except the Blue Lightning is a lot more expensive.
Don't mind spending the extra money if it's worth it.
They seem to be very similar except the Blue Lightning is a lot more expensive.
Don't mind spending the extra money if it's worth it.
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