3M DI-NOC looks and feels very real, but is also is very expensive. For a 36"x48" piece, it costs around $100 on eBay.

Did you consider a carbon fiber fabric instead of 3M DI-NOC? Neffywrap is $35 per linear yard (36"x55") and you can find it for cheaper on eBay (as low as $25 per linear yard). The only downside to this fabric is that it needs glue to stick to the trim, not like the no/little residue type of adhesive on 3M DI-NOC. Still, I think fabric would be cheaper as you can always remove the glue residue by 3M Adhesive Remover or Goo Gone.

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