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headcount 19-07-2020 09:42 PM

Wet sanding a plastic bumper
Good evening all,

I managed to damage my bumper on my car today, only two very small chips but annoying all the same. I have filled the chips with touch up paint but they are obviously standing proud of the bumper. Is it safe to wet sand a plastic bumper? I have some 2000 grit wet n dry paper and a Megs G220 orbital polisher with various compound so happy to have a go to make it right if I can.

Many thanks.

BrianGT 19-07-2020 10:12 PM

Yes you can wet sand the bumper but you have to be careful. It does have primer, paint and lacquer same as the bodywork.

Try and just take the top off the paint chip so that you don't really enlarge the area. It's not easy but I have done it on my Celica a few times. Then you can compound it and polish it out.
I use a small piece of wood around 30mm long by 20mm high by 5mm wide so that I can wrap the sandpaper round it and only have a small contact area on the 5mm side. I can usually just take the proudness out.
Be careful with heat on plastic as it can implode on itself but a chip won't be large enough to generate that sort of heat.
Good luck!

headcount 20-07-2020 05:46 PM

Thanks. I’ll have a go in a few days.

headcount 23-07-2020 08:51 PM

Is 2000 grit wet n dry a good paper to use?

BrianGT 23-07-2020 09:04 PM


Originally Posted by headcount (Post 5665351)
Is 2000 grit wet n dry a good paper to use?

It depends on how big the "bump" is. If it is quite proud I would go coarser to take it down a bit. Say 1000 on a very small block done very patiently. Once you can see the bump disappear and almost level then go down to 2000, with 1500 in between if you have it.

It's hard to say without seeing it but the aim is to take the top off and touch as little around it as you can. It's inevitable that you are going to sand around it so when you see it blend in use as fine a paper as you have. Use it wet.

You will be surprised how good you can get it to look if you really go slow and methodical. You can buy packs of wet and dry from Halfords that go from around 1000-2500.

Good luck.

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