What is the purpose of wet sanding a car?

Wet sanding is an amazing process that, when done properly, can result in a surface that's as smooth as glass. Whether you're talking about paint, primer, bare metal or anything in between, your car's body can be smoothed by wet sanding. Wet sanding, also known as color sanding, adds shine to a finished paint job.

What grit sandpaper for wet sanding a car?

Sandpaper Selection Chart

320 gritoptional final sanding before using primer and also for sanding spot putty.
400 gritrough sanding primer or for fine sanding spot putty.
600 gritfinal sanding primer, sand with 600 before using basecoat colors.
1000 gritwet sanding a panel to be repainted.

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