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Caswell Inc.
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Kits and guides for plating and finishing, frequently recommended.
More resources on Metal Finishing
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Products Finishing
Industry articles and forums on metal finishing processes.
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Patina Finishes for Steel
Artist techniques for metal patinas, highly upvoted.
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Anodizing Aluminum at Home
Step-by-step home anodizing process recommended in finishing threads.
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Ultimate Metal Polishing Guide
Comprehensive tutorial on polishing techniques from r/Metalworking top comment.