Carbon fibre finishing with a sander


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Mit123
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Hi,

I have skinned some car parts for my car using the XCR kit.

I have skinned quite alot of parts and have got to the final stage of finishing with 400-1200 grit sandpaper.

I am looking to speed up the process by using a sanding machine with the 400-1200 grit papers.

Which is a good sander to use?

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Mit123
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Mit123 - 2/4/2020 11:55:06 PM
Hanaldo - 2/4/2020 11:42:03 PM
Yeh there really is a bit of an art to refinishing, it took me 6 years of doing composites professionally to get to a stage where I can polish parts and truly get rid of all scratches and swirls. It takes a lot of practice and patience to get the feel for it, so be prepared for the fact that you may get a few results like this one or it will take you many many hours to get to the standard you are after. It may well be a lot easier to get the part clear coated if this isn't something you are wanting to invest a lot of time in.

It is especially difficult to polish out to a true full gloss starting from 320 grit. As a rule, if I have to go rougher than 800 grit to flat the part down, then I don't even bother trying to polish it out, I'll flat it down with 320 and then hit it with clear to bring the gloss back. From there it certainly shouldn't take rougher than 1200 grit to the the desired surface finish, then I move through 1500>2000>2500>3000>4000. You can compound from 1200 upwards so you can skip the finer stages if you prefer, but be aware it does actually take quite a lot of compounding to get rid of 1200 grit scratches. Significantly quicker and uses less polish to go all the way up to 4000, unless the part is very small.

Hi, when you refer to using a clear coat are you referring to using a spray can or to re-do the final coat of clear resin? 

Ive unfortunatley hit all of the parts in the 1st batch with 320 now so may have to go down the route suggested .

Also should I sand up to 800-1000 before applying the spray clear, to reduce any scratches from showing through?

GO

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