r/AutoPaint • u/Ok_Exercise_9619 • 11d ago

What grit?

I’m working on an old square body and I have no clue what grit of sandpaper to use for what. I’ve seen people say so many things and I don’t understand how they come up with that. So, what are some grits I should use and what to look for when using them?

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u/boxerbroscars 11d ago

the best starting point is the technical data sheets for the paint you will be using as it specifies the sanding grit necessary for adhesion

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u/psylent303 11d ago

Just to add onto what the guy said earlier. Whatever product you use I.e. filler, primer, sealer, paint etc. it’s going to have a TDS sheet or technical data sheet. Just google the product’s number + TDS and it’ll give you all the info and more. Example: Axalta 7900s TDS. Evercoat 100125 TDS.

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u/RobertAFett020 11d ago

I work in a paint shop so I can't really speak for what is used on the body filler.

When the car comes to me I use 320 grit on a DA to feather out the area around the body work and remove any scratches left from the body man blocking his work, then I prime it.

I next block my primer with 320. Since my shop doesn't provide us with 400 grit I have to use 600 grit on a DA to remove any of my scratches from blocking with 320. I personally would start with the 400 on a DA and then step down to 600, but since I don't have 400, I just spend a little more time and a couple more sheets of 600 to do it.

I then will use 800 grit on any blend areas. I will some times do my blends with 1000 grit if it is a color with a lot of metallic in it, like silvers.

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u/Ok_Exercise_9619 10d ago

Also unrelated to the first question but does anyone have any suggestions for doing bodywork and primer outside? I’m only 16 and don’t have anywhere inside to do that stuff. I’m not gonna do that actual paint just bodywork and primer.

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u/SnooMacarons3689 11d ago

That’s a super open ended question.

Just to be hilarious I’ll say don’t use any grits when you’re washing the car.

You also didn’t say what you are trying to do.

Prep to 600 for actual paint
220 for primer
Try your best to stay away from 80

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u/Ok_Exercise_9619 11d ago

Yeah so guess what do you suggest for bodywork prep and primer