Wrong DA?

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plumkrazee70

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I have this DA: FREE SHIPPING — Ingersoll Rand Dual Action Air Sander — 6in. Dia, 4 CFM, 10,000 RPM, Model# 311A | Air Sanders| Northern Tool + Equipment but it isn't really doing much. I think it is a finishing DA. I am stripping panels for epoxy using 80 grit.

I have read about using 36-40 but I am worried that is too aggressive.

I have a electric die grinder and a air angle grinder.

Should I get a different DA or stripping discs for the die grinder or angle grinder? The die grinder isn't speed adjustable.
 
I have this DA: FREE SHIPPING — Ingersoll Rand Dual Action Air Sander — 6in. Dia, 4 CFM, 10,000 RPM, Model# 311A | Air Sanders| Northern Tool + Equipment but it isn't really doing much. I think it is a finishing DA. I am stripping panels for epoxy using 80 grit.

I have read about using 36-40 but I am worried that is too aggressive.

I have a electric die grinder and a air angle grinder.

Should I get a different DA or stripping discs for the die grinder or angle grinder? The die grinder isn't speed adjustable.
Looks like a nice sander too me. Will use LOTS of 80 grit to remove all the paint off a car. Rolls and rolls.
 
That DA should be fine for taking panels down to shiny metal BUT there are many variables that will affect how well it works. What size is your compressor? Brand of paper your using? How many coats of paint on the car? Is it enamel or Imron? If the paint is thick then 40 would be OK to get it close. If original paint or maybe one repaint a quality paper like Duragold in 80 grit will do the job, you will just need to change it often and be patient.
 
That DA should be fine for taking panels down to shiny metal BUT there are many variables that will affect how well it works. What size is your compressor? Brand of paper your using? How many coats of paint on the car? Is it enamel or Imron? If the paint is thick then 40 would be OK to get it close. If original paint or maybe one repaint a quality paper like Duragold in 80 grit will do the job, you will just need to change it often and be patient.

I have a a 80 gallon 5hp compressor 15 c.f.m

I am also using 80 grit dura gold paper. The car has the original paint with one base coat clear coat paint job. I was being patient but its seems like it is taking a long time.
 
I have a a 80 gallon 5hp compressor 15 c.f.m

I am also using 80 grit dura gold paper. The car has the original paint with one base coat clear coat paint job. I was being patient but its seems like it is taking a long time.
For me, 80 was all I ever needed. And I used the Gold 80 grit DA paper, 100's of sheets for a car. Need to keep it changed often.
 
Looks like a nice sander too me. Will use LOTS of 80 grit to remove all the paint off a car. Rolls and rolls.
For paint busting I use an air buffer with a thick flexible pad and 40 grit hog paper. 36 grit is to aggressive.
Once paint has bee stripped to bare metal, go over it with 80 grit on a DA. This will give you a good tooth for
epoxy primer and then catalyzed primer over that. As long as no old paint remains this is an effective method.
Existing old paint can suck up primer and shrink. A bare metal surface will not shrink paint materials
 
To speed up the paint stripping process you can rotate the counter weight on the DA so its a rotary sander just be careful around the edges.
 
I was going to mention the little weight,turning it will lock the wheel to the shaft,but it suckholes for power. One sanding disc will maybe do one square foot. So a roll to do one side of the car,1/2 roll for the roof.
Better off to leave the paint and sand it with 320 and hit it with a fresh coat.
 
thanks everyone for the replies. I'm going to be using SPI epoxy primer and it specifically states that needs to be bare metal.

I guess I was expecting more progress with 80. Ill try 40 and then hit with 80 after I get close.
 
thanks everyone for the replies. I'm going to be using SPI epoxy primer and it specifically states that needs to be bare metal.

I guess I was expecting more progress with 80. Ill try 40 and then hit with 80 after I get close.
well if I were in your shoes I'd use a paint stripper my god don't use 40 grit take your time and don't turn the heat up on the grinder you will warp the metal and be in a pickle. paint stripper is nasty **** but if you keep your fingers out of it and have plenty of air movement in your work area you'll do fine. you can't rush it, it takes time. trust me been there
 
To speed up the paint stripping process you can rotate the counter weight on the DA so its a rotary sander just be careful around the edges.
Yep . This is how I do it. If you don't lock it in ,it will take forever. It does use a lot of air though. I use 80 grit for stripping. For tight spots I use a Roloc disc like this: Scotch-Brite Roloc Disk Surface Conditioning Disc Brown Make sure you move around and don't get the metal too hot. I hate paint stripper but I will occasionally use it on trunk lids and hoods.
 
Yep . This is how I do it. If you don't lock it in ,it will take forever. It does use a lot of air though. I use 80 grit for stripping. For tight spots I use a Roloc disc like this: Scotch-Brite Roloc Disk Surface Conditioning Disc Brown Make sure you move around and don't get the metal too hot. I hate paint stripper but I will occasionally use it on trunk lids and hoods.
good idea on the roloc but been using paint stripper to many years to stop now
 
For paint busting I use an air buffer with a thick flexible pad and 40 grit hog paper. 36 grit is to aggressive.
Once paint has bee stripped to bare metal, go over it with 80 grit on a DA. This will give you a good tooth for
epoxy primer and then catalyzed primer over that. As long as no old paint remains this is an effective method.
Existing old paint can suck up primer and shrink. A bare metal surface will not shrink paint materials
I've been using the same method for decades. 8 inch psa pad on a rotary buffer.
 
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One other thing, running the da too fast just burns up paper. Try a lower rpm. Good paper makes a big difference when stripping. 3m red paper works for me and fairly cost competitive with lesser brands.
 
After further thought. Im gonna use aircraft stripper. I read a trick about covering it with saran wrap, which will aid in removing more finish. Ill be sure to ventilated and lay down plastic.
 
take it down to the e-coat then finish with a da
I remember using DP40 on bare metal nasty bad **** but it worked can't get it anymore. so now we have to use an etch primer and it seems just as bad but EPA says it's good for the environment but DP40 was better. any body remember DP40
 
After further thought. Im gonna use aircraft stripper. I read a trick about covering it with saran wrap, which will aid in removing more finish. Ill be sure to ventilated and lay down plastic.
good idea and cheaper than a roll of sand paper and running the air compressor and all that noise
 
The first two shops I worked in used PPG, so I've used a bunch of DP40. I haven't used any of the DP40LF (lead free) but it seem that people don't like it nearly as well as the old stuff. I've been using the SPI epoxy on my own projects and really like it.
 
The first two shops I worked in used PPG, so I've used a bunch of DP40. I haven't used any of the DP40LF (lead free) but it seem that people don't like it nearly as well as the old stuff. I've been using the SPI epoxy on my own projects and really like it.
I'm wondering if it will hold up after 10 years. It's seems that all the new primers and paint are getting better but I still worry about the base. I try to get my bondo and bare metal in 180 grit because I don't like using a ton of primer. I think the better you get the bondo straight the less primer you need. and less blocking and priming and blocking and priming.
 
For me, 80 was all I ever needed. And I used the Gold 80 grit DA paper, 100's of sheets for a car. Need to keep it changed often.
Totally Agree. If you try to use sandpaper too long (past its ideal life), you are just hurting yourself. A piece of 80 grit that is almost worn smooth will slow you down a lot! If a car has several paint jobs on it, I guess you could hit it with 40 grit to take off some paint, but be careful. I would either just use lots of 80 grit or use a chemical stripper.
 
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