Carbon wet vacuum layup on wood


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Dentex
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Hy guys. 
I work on a project that requires wraping wooden tapered ellipsoid object in 2 layers of carbon fiber. Carbon is added for stiffness and visual appearence so nice layup is must.

Carbon goes from bottom of part and goes on sides, it doesnt go all the way around.

I have to use wet layup method combined with vacuum so my plan is to:
1. Cover wood with black tinted epoxy
2. Wait for tacky stage and add first layer
3. Add resin to saturate fabric
4. Wait for tacky stage to add other layer
5. Add resin to saturate fabric
6. Place peel ply and breather and use around 20% vacuum to remove excess resin

My questions are:
1. Will 20% vacuum remove excess resin since most of resin reached tacky or beyond tacky stage?
2. Is there anything to change in the process to ensure good bond and appearance?
3. Process is like skinning with carbon only using 2 layers instead of one and using vacuum to remove excess resin. Should I do like plan above or should I do 1 layer, wait it to cure, key whole surface and repeat process for 2nd layer?

Thanks Smile
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Fasta
Fasta
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Dentex - 3/29/2021 5:26:22 PM
I haven't really worked with carbon yet, only with fiberglass and it was mostly CSM so I have no idea how will carbon act. 

I am afraid that without tacky layer(s) and vacuum, fabric will resist staying in place on those curves with just plain wetting and placing.

You can do the tacky coat, it will really add only a very very small amount to the job. Just coat with resin and wait for 30 min depending on the resin curing.
If it is a clean enough round-ish shape without any fine details then a peel ply tape wrapping (or shrink wrap type film) will hold the carbon in place easy. For peel ply just pull a little tension on as you go and overlap about 50% to and this should give an even finish and will also squeeze out any excess resin.

Vacuum bagging small circular shapes can be a problem as the vacuum often pinches the fabric into a crease/pleat which will really mess up any plans for a nice cosmetic finish.





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