Should I apply a very thick first coat of epoxy before sanding?


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FiftyPence
FiftyPence
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Hello everyone,

I am hand-laying a car door trim in easycomposites pro-finish 2x2 twill carbon fibre.  Here is my workflow:

  1. Sand down the part
  2. Apply black basecoat
  3. Allow basecoat to go tacky, ~2.5-3hrs
  4. Apply profinish carbon fibre material to the part and press it down firmly onto the basecoat
  5. Allow to cure overnight
  6. Apply epoxy top coat to the part
  7. The next step according to the video would be to sand down the layer of epoxy
  8. Apply second coat of epoxy
  9. Allow epoxy to go tacky
  10. Apply subsequent layers of epoxy
Here's the problem:


On my last attempt, the carbon fibre cloth was still showing through the layer of epoxy so if I sand then I would be sanding the carbon fibre itself and some epoxy.

Should I apply a very thick first coat of epoxy to ensure that it covers the carbon fibre cloth sufficiently so that the cloth is not showing through and so that there is enough epoxy coat to sand into?

Thanks for your help!
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FiftyPence
FiftyPence
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I ordered 1kg of easy composites coating resin last night because I expect to use alot in future so when it arrives I can get cracking again.
fgayford
fgayford
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Glad to here that. I tried using laminating resin to see if it would work and it just would not fill no matter how many layers I built up. The skinning resin is a treat to use. One note, when you put your second layer on make sure it is still at a tack free state but is still some what sticky. If you miss this point and put on resin when it is dry it will not stick. You will have to sand first.( I always put 2 coats on before I sand)
Fred
GO

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