New guy to carbon fibre and the forum


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dr3bin
dr3bin
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Hey everyone,

I'm new to carbon fibre. Took an interest after looking through Carbon Mods and watching their videos, so I thought I'd give skinning a go as I have a few parts I'd like to carbon-fibre up

I have (what I class as) a 'fairly simple' shape. A spark plug cover for my car. First time I've ever skinned anything, so I knew it'd mess it up. Which I did. A load of times. However the finished product finally came out and it looks like this;



The major issues I have is the finish is rubbish. I didn't go up the grades of sandpaper long enough and you can see fine lines. There's little white dots in the resin which I believe are air bubbles. Hammering it with a low-temp heat gun didn't get rid of all the air, so it appears. Also the resin became contaminated as I re-used a brush (washed and soaked in acetone) with fresh resin for the final layer, but the resin dried as a complete fog instead of nice and clear. So about 8 hours of sanding pursued to get it to a semi-finished state, as above. You can kind of see the fogged resin along the bottom of the part. I've learnt from that to use a new brush for each layer.

However, my main gripe is how on earth do I prep the carbon fibre cloth to accommodate the bolt holes. On the above example, I skinned the part, done all the resin layers before drilling the holes through - starting with a small drill bit and working my way up. But, this messed it up as the part eventually chipped around the edges resulting in a poor finish, rather than leaving it with a nice edge to work on with a file to get a nice, flat edge. Took me about 30 minutes of drilling as I knew to take it slowly and carefully. 

I tried cutting the fabric prior to laying the resin, however this frayed the cloth and put it all out of alignment with itself. I can't re-use the part as the fabric is bonded to the part so I binned it

I'm getting pretty annoyed with this process as I want to get this part perfect so I can sell it to my car club. I know I can do it, I'm just missing knowledge that a training course or other, experienced people would be able to offer. Thus me joining up on here Smile

Any advice would be greatly appreciated
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fgayford
fgayford
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Your closer to success than you think.

Firsts of all I have delt with all the problems you have named so far. So I have done the pain and now make perfect parts this way.

So here is my opinion which others may disagree with?

When you follow the skinning process and you are at the brushing the resin on part, make sure to go about 3 coats and let that cure overnight at a good warm temperature. MAKE SURE you get the second coat on while the first coat is still tacky but doesn't come off on your finger. If it is somewhat dry to the touch your too late and the second coat will be a mess. (I did it already) same with the third coat. (also, pop the bubbles with a hairdryer or heat gun after each coat. your resin should be warmed before you coat your part also)

Now wet sand flat but don't go into the fiber. Wipe down with 99% pure alcohol and apply another 3 coats as above.

Once cured wetsand down to get the part flat. Forget about polish at this stage, you really must spray your part with 2K automotive clear coat to get the magic to happen. Once you have put on  3 coats of clear wet sand flat and apply 3 more clear again, but before you wet sand let the part cure completely in a warm place for a few days.

Now wet sand to (I go all the way up to 2500) and then polish.(I use 3m 3 stage polish) Now you have a carshow shine!!

So lets say you have a bubble? I use a jewelers googles and with a large pin puncture the bubbles, some times I use a tiny drill bit turning it in my fingers and get to the bottom of the hole. I then mix up some clear coat and dab the pin into it and then put the pin in the hole letting the clear run down filling the hole. Let it go proud of the hole. Once cured use really fine wet paper and flat sand it level. Once all your holes are filled and flattened wipe down with alcohol and spray clear on again, sand , polish and your done. This sounds like a lot of work but the end result is worth it.

Don't drill your hole with a drill bit. I have a carbon burr on my dremel (its about 1/8 inch dia) I can open the hole with total control and a perfect edge.

 Hope this helps.

Fred
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