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It depends if you want to apply this physically, as in actual geometry that can be machined, or just for the purposes of a rendering? If it is physically I wouldn't bother - just add it as a note on your drawings and get the toolmaker to etch the surface with a Mold-Tech texture or similar. If it is for a rendering you could do this in PhotoWorks by applying a bump map to the surfaces affected. Google images is quite a good source for bump maps like this - but use with care!
Also you could scan the actual texture from the Mold-Tech sample swatch (if you have one) and use this.