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Coating a hole with carbon black or other electroless plate

I need to coat the holes in a plastic display device with 1/2 micron of Ni, Pd, carbon black, elctroless Cu, or graphite. This is the electroless portion of the coat (there won't be a electroplating step because I want to remove the coating from the top and bottom surfaces later). There are 2000 A of aluminum on top and bottom surfaces too but not in the holes. the substrate is PET. The holes are 5 mil deep (through holes), and 4 mil wide. Any ideas? Thanks.

Mike Sereda
- Milpitas, California

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The process of Vapour Deposition of Nickel will provide the coating you need. The substrate can be masked to allow for the nickel coating to deposit only where required. This may save you the need to remove coating later. The substrate can be any material, but it must be stable at the deposition temperature of 375degF and must not off-gas.

Mick O'Meara
- Toronto, Canada