There’s definitely a time and a place for both. I recommend having both of these grits in your toolbox if you’re doing any type of panel work. I try to use 80-grit paper as much as possible but there are times when 40-grit makes sense.Ĥ0 Grit will sand a car to bare metal quicker while keeping the panel cooler in temperature. We don’t want to damage the substrate! We’re trying to repair it. It’s very hard to remove these scratches by sanding them out and will almost always require filler or Bondo. The other problem with 36 or 40 grit discs is the scratches that it leaves behind. If you see sparks flying when you’re sanding, it’s cutting into the panel and weakening it. Unfortunately, if you have a rubbish brand of sandpaper and 80 grit disc will just tickle the panel.Ĥ0 grit paper is seen as too harsh of an abrasive. If you have a high-quality 80-grit sandpaper from Mirka or 3M it will remove the paint in no time. Nowadays, IMI, the institute of the motor industry swears by using 80 grit. If you speak to an old-school panel beater or body technician, they’ll probably tell you 40 grit. This is because the 80 grit doesn’t damage the substrate. The quickest and safest way is using P80 grit. The quickest way to sand a car to bare metal is to use P40 sandpaper. What grit sandpaper should I use to sand a car to bare metal? ![]() If you don’t use this rule, you will end up damaging materials and creating a lot more work for yourself.Īs you become more experienced you’ll know what you can get away with, but until then, it’s best to be on the safe side. The most important rule of auto body sanding is: Always use the least abrasive paper possible to get the job done.
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