Talk Composites - The Forum for Advanced Composites

Carbon Fibre Resin

http://www.talkcomposites.com/Topic27094.aspx

By apexx - 5/26/2018 11:13:56 AM

Hi guys, first post!

So I picked up a carbon fibre part the weekend for quite cheap. There’s a few problems with it but I thought I could use it as a little project.
So the carbon on it looks okay, it’s unused, there’s a few deforms parts or the carbon but the main parts looks good. The resin or coating looks really poor though, I don’t know what has been done to it but there’s lots of dimples in and thick and thin parts of where’s the resins dries quickly.
I’ll try and attach pictures, but am I right in guessing I need to sand down the layer and re apply some resin? Is this too much for a beginner?
Thanks!
By Fasta - 5/27/2018 9:28:59 AM

 
apexx - 5/27/2018 9:08:13 AM
 
Fasta - 5/27/2018 2:29:36 AM
I would not use a resin as I find them just too hard to sand especially if there is details and they can pool /run easily too.

Sand and spray with Duratec sunshield, sand again and spray with 2 part clear top coat.

 


Thanks for the reply, will this give me a glossy/glass like effect which is what I’m hoping for!
Cheers

Definteley. The Duratec alone can give a nice finish but this is easier when it is sprayed in one or two coats. The duratec has a really good filling/build and self leveling properties although it can be tricky to fill any porosity. If there is a porosity to fill then I would brush a coat of the duratec first, then imediately spray duratec to get some fill and an improved surface. Being easier to sand you can use finer sandpapers to begin with. I would start with 180 dry paper and finish up with 800 grit wet sanding before applying your two part top coat. The duratec needs 5-10% MEK thinner too.
By Hanaldo - 5/27/2018 1:47:45 PM

It will if you know your way around a spray gun. If you don't quite know how to get a glass flat surface with a spray gun then it might be worth practising a bit first.